Update Rust crate async-trait to v0.1.81 (#15564)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [async-trait](https://togithub.com/dtolnay/async-trait) |
workspace.dependencies | patch | `0.1.77` -> `0.1.81` |

---

### Release Notes

<details>
<summary>dtolnay/async-trait (async-trait)</summary>

###
[`v0.1.81`](https://togithub.com/dtolnay/async-trait/releases/tag/0.1.81)

[Compare
Source](https://togithub.com/dtolnay/async-trait/compare/0.1.80...0.1.81)

- Turn off unneeded features of `syn` dependency
([#&#8203;272](https://togithub.com/dtolnay/async-trait/issues/272),
thanks [@&#8203;klensy](https://togithub.com/klensy))

###
[`v0.1.80`](https://togithub.com/dtolnay/async-trait/releases/tag/0.1.80)

[Compare
Source](https://togithub.com/dtolnay/async-trait/compare/0.1.79...0.1.80)

- Fix unreachable code warning for async functions that return `!`
([#&#8203;265](https://togithub.com/dtolnay/async-trait/issues/265),
thanks [@&#8203;de-vri-es](https://togithub.com/de-vri-es))

###
[`v0.1.79`](https://togithub.com/dtolnay/async-trait/releases/tag/0.1.79)

[Compare
Source](https://togithub.com/dtolnay/async-trait/compare/0.1.78...0.1.79)

-   Clean up some dead code

###
[`v0.1.78`](https://togithub.com/dtolnay/async-trait/releases/tag/0.1.78)

[Compare
Source](https://togithub.com/dtolnay/async-trait/compare/0.1.77...0.1.78)

- Prevent unused_qualifications lint being triggered in generated code
in nightly-2024-03-05 and up
([#&#8203;260](https://togithub.com/dtolnay/async-trait/issues/260))

</details>

---

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---

Release Notes:

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Cargo.lock

@@ -881,9 +881,9 @@ checksum = "8b75356056920673b02621b35afd0f7dda9306d03c79a30f5c56c44cf256e3de"
 
 [[package]]
 name = "async-trait"
-version = "0.1.77"
+version = "0.1.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c980ee35e870bd1a4d2c8294d4c04d0499e67bca1e4b5cefcc693c2fa00caea9"
+checksum = "6e0c28dcc82d7c8ead5cb13beb15405b57b8546e93215673ff8ca0349a028107"
 dependencies = [
  "proc-macro2",
  "quote",