Replace is-terminal with std's and bump MSRV to 1.70

.github/workflows/ci.yaml

@@ -37,7 +37,7 @@ jobs:
         include:
           - os: ubuntu-latest
             # Should be sync with Cargo.toml
-            channel: '1.68'
+            channel: '1.70'
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout

Cargo.lock

@@ -746,7 +746,6 @@ dependencies = [
  "async-lsp",
  "codespan-reporting",
  "ide",
- "is-terminal",
  "log",
  "lsp-types",
  "macro_rules_attribute",

Cargo.toml

@@ -14,7 +14,7 @@ version = "0.0.0"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 # Should be sync with CI.
-rust-version = "1.68"
+rust-version = "1.70"
 
 [profile.dev]
 debug = 1

crates/nil/Cargo.toml

@@ -11,7 +11,6 @@ argh = "0.1.10"
 async-lsp = "0.0.4"
 codespan-reporting = "0.11.1"
 ide = { path = "../ide" }
-is-terminal = "0.4.7"
 log = "0.4.17"
 lsp-types = "0.94.0"
 macro_rules_attribute = "0.2.0"

crates/nil/src/main.rs

@@ -2,7 +2,7 @@ use anyhow::{Context, Result};
 use argh::FromArgs;
 use codespan_reporting::term::termcolor::WriteColor;
 use ide::{AnalysisHost, Severity};
-use is_terminal::IsTerminal;
+use std::io::IsTerminal;
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use std::{env, fs, io, process};