chore: bump up rustc version to v1.81.0 (#8126)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rustc](https://redirect.github.com/rust-lang/rust) | minor | `1.80.1` -> `1.81.0` |

---

### Release Notes

<details>
<summary>rust-lang/rust (rustc)</summary>

### [`v1.81.0`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1810-2024-09-05)

[Compare Source](https://redirect.github.com/rust-lang/rust/compare/1.80.1...1.81.0)

\==========================

<a id="1.81.0-Language"></a>

## Language

-   [Abort on uncaught panics in `extern "C"` functions.](https://redirect.github.com/rust-lang/rust/pull/116088/)
-   [Fix ambiguous cases of multiple `&` in elided self lifetimes.](https://redirect.github.com/rust-lang/rust/pull/117967/)
-   [Stabilize `#[expect]` for lints (RFC 2383),](https://redirect.github.com/rust-lang/rust/pull/120924/) like `#[allow]` with a warning if the lint is *not* fulfilled.
-   [Change method resolution to constrain hidden types instead of rejecting method candidates.](https://redirect.github.com/rust-lang/rust/pull/123962/)
-   [Bump `elided_lifetimes_in_associated_constant` to deny.](https://redirect.github.com/rust-lang/rust/pull/124211/)
-   [`offset_from`: always allow pointers to point to the same address.](https://redirect.github.com/rust-lang/rust/pull/124921/)
-   [Allow constraining opaque types during subtyping in the trait system.](https://redirect.github.com/rust-lang/rust/pull/125447/)
-   [Allow constraining opaque types during various unsizing casts.](https://redirect.github.com/rust-lang/rust/pull/125610/)
-   [Deny keyword lifetimes pre-expansion.](https://redirect.github.com/rust-lang/rust/pull/126762/)

<a id="1.81.0-Compiler"></a>

## Compiler

-   [Make casts of pointers to trait objects stricter.](https://redirect.github.com/rust-lang/rust/pull/120248/)
-   [Check alias args for well-formedness even if they have escaping bound vars.](https://redirect.github.com/rust-lang/rust/pull/123737/)
-   [Deprecate no-op codegen option `-Cinline-threshold=...`.](https://redirect.github.com/rust-lang/rust/pull/124712/)
-   [Re-implement a type-size based limit.](https://redirect.github.com/rust-lang/rust/pull/125507/)
-   [Properly account for alignment in `transmute` size checks.](https://redirect.github.com/rust-lang/rust/pull/125740/)
-   [Remove the `box_pointers` lint.](https://redirect.github.com/rust-lang/rust/pull/126018/)
-   [Ensure the interpreter checks bool/char for validity when they are used in a cast.](https://redirect.github.com/rust-lang/rust/pull/126265/)
-   [Improve coverage instrumentation for functions containing nested items.](https://redirect.github.com/rust-lang/rust/pull/127199/)
-   Target changes:
    -   [Add Tier 3 `no_std` Xtensa targets:](https://redirect.github.com/rust-lang/rust/pull/125141/) `xtensa-esp32-none-elf`, `xtensa-esp32s2-none-elf`, `xtensa-esp32s3-none-elf`
    -   [Add Tier 3 `std` Xtensa targets:](https://redirect.github.com/rust-lang/rust/pull/126380/) `xtensa-esp32-espidf`, `xtensa-esp32s2-espidf`, `xtensa-esp32s3-espidf`
    -   [Add Tier 3 i686 Redox OS target:](https://redirect.github.com/rust-lang/rust/pull/126192/) `i686-unknown-redox`
    -   [Promote `arm64ec-pc-windows-msvc` to Tier 2.](https://redirect.github.com/rust-lang/rust/pull/126039/)
    -   [Promote `wasm32-wasip2` to Tier 2.](https://redirect.github.com/rust-lang/rust/pull/126967/)
    -   [Promote `loongarch64-unknown-linux-musl` to Tier 2 with host tools.](https://redirect.github.com/rust-lang/rust/pull/126298/)
    -   [Enable full tools and profiler for LoongArch Linux targets.](https://redirect.github.com/rust-lang/rust/pull/127078/)
    -   [Unconditionally warn on usage of `wasm32-wasi`.](https://redirect.github.com/rust-lang/rust/pull/126662/) (see compatibility note below)
    -   Refer to Rust's \[platform support page]\[platform-support-doc] for more information on Rust's tiered platform support.

<a id="1.81.0-Libraries"></a>

## Libraries

-   [Split core's `PanicInfo` and std's `PanicInfo`.](https://redirect.github.com/rust-lang/rust/pull/115974/) (see compatibility note below)
-   [Generalize `{Rc,Arc}::make_mut()` to unsized types.](https://redirect.github.com/rust-lang/rust/pull/116113/)
-   [Replace sort implementations with stable `driftsort` and unstable `ipnsort`.](https://redirect.github.com/rust-lang/rust/pull/124032/) All `slice::sort*` and `slice::select_nth*` methods are expected to see significant performance improvements. See the [research project](https://redirect.github.com/Voultapher/sort-research-rs) for more details.
-   [Document behavior of `create_dir_all` with respect to empty paths.](https://redirect.github.com/rust-lang/rust/pull/125112/)
-   [Fix interleaved output in the default panic hook when multiple threads panic simultaneously.](https://redirect.github.com/rust-lang/rust/pull/127397/)

<a id="1.81.0-Stabilized-APIs"></a>

## Stabilized APIs

-   [`core::error`](https://doc.rust-lang.org/stable/core/error/index.html)
-   [`hint::assert_unchecked`](https://doc.rust-lang.org/stable/core/hint/fn.assert_unchecked.html)
-   [`fs::exists`](https://doc.rust-lang.org/stable/std/fs/fn.exists.html)
-   [`AtomicBool::fetch_not`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicBool.html#method.fetch_not)
-   [`Duration::abs_diff`](https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.abs_diff)
-   [`IoSlice::advance`](https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance)
-   [`IoSlice::advance_slices`](https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance_slices)
-   [`IoSliceMut::advance`](https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance)
-   [`IoSliceMut::advance_slices`](https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance_slices)
-   [`PanicHookInfo`](https://doc.rust-lang.org/stable/std/panic/struct.PanicHookInfo.html)
-   [`PanicInfo::message`](https://doc.rust-lang.org/stable/core/panic/struct.PanicInfo.html#method.message)
-   [`PanicMessage`](https://doc.rust-lang.org/stable/core/panic/struct.PanicMessage.html)

These APIs are now stable in const contexts:

-   [`char::from_u32_unchecked`](https://doc.rust-lang.org/stable/core/char/fn.from_u32\_unchecked.html) (function)
-   [`char::from_u32_unchecked`](https://doc.rust-lang.org/stable/core/primitive.char.html#method.from_u32\_unchecked) (method)
-   [`CStr::count_bytes`](https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.count_bytes)
-   [`CStr::from_ptr`](https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.from_ptr)

<a id="1.81.0-Cargo"></a>

## Cargo

-   [Generated `.cargo_vcs_info.json` is always included, even when `--allow-dirty` is passed.](https://redirect.github.com/rust-lang/cargo/pull/13960/)
-   [Disallow `package.license-file` and `package.readme` pointing to non-existent files during packaging.](https://redirect.github.com/rust-lang/cargo/pull/13921/)
-   [Disallow passing `--release`/`--debug` flag along with the `--profile` flag.](https://redirect.github.com/rust-lang/cargo/pull/13971/)
-   [Remove `lib.plugin` key support in `Cargo.toml`. Rust plugin support has been deprecated for four years and was removed in 1.75.0.](https://redirect.github.com/rust-lang/cargo/pull/13902/)

<a id="1.81.0-Compatibility-Notes"></a>

## Compatibility Notes

-   Usage of the `wasm32-wasi` target will now issue a compiler warning and request users switch to the `wasm32-wasip1` target instead. Both targets are the same, `wasm32-wasi` is only being renamed, and this [change to the WASI target](https://blog.rust-lang.org/2024/04/09/updates-to-rusts-wasi-targets.html) is being done to enable removing `wasm32-wasi` in January 2025.

-   We have renamed `std::panic::PanicInfo` to `std::panic::PanicHookInfo`. The old name will continue to work as an alias, but will result in a deprecation warning starting in Rust 1.82.0.

    `core::panic::PanicInfo` will remain unchanged, however, as this is now a *different type*.

    The reason is that these types have different roles: `std::panic::PanicHookInfo` is the argument to the [panic hook](https://doc.rust-lang.org/stable/std/panic/fn.set_hook.html) in std context (where panics can have an arbitrary payload), while `core::panic::PanicInfo` is the argument to the [`#[panic_handler]`](https://doc.rust-lang.org/nomicon/panic-handler.html) in no_std context (where panics always carry a formatted *message*). Separating these types allows us to add more useful methods to these types, such as `std::panic::PanicHookInfo::payload_as_str()` and `core::panic::PanicInfo::message()`.

-   The new sort implementations may panic if a type's implementation of [`Ord`](https://doc.rust-lang.org/std/cmp/trait.Ord.html) (or the given comparison function) does not implement a [total order](https://en.wikipedia.org/wiki/Total_order) as the trait requires. `Ord`'s supertraits (`PartialOrd`, `Eq`, and `PartialEq`) must also be consistent. The previous implementations would not "notice" any problem, but the new implementations have a good chance of detecting inconsistencies, throwing a panic rather than returning knowingly unsorted data.

<a id="1.81.0-Internal-Changes"></a>

## Internal Changes

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

-   [Add a Rust-for Linux `auto` CI job to check kernel builds.](https://redirect.github.com/rust-lang/rust/pull/125209/)

</details>

---

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rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.80.1"
+channel = "1.81.0"
 profile = "default"