meta: set MSRV of 1.81, update GHA

Author: mcginty

.github/workflows/rust.yml

@@ -3,10 +3,10 @@ name: Build
 on:
   push:
     branches:
-      - '*'
+      - "*"
   pull_request:
     branches:
-      - '*'
+      - "*"
 
 env:
   CARGO_TERM_COLOR: always
@@ -18,17 +18,22 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+        rust: [stable, beta, nightly, 1.81.0]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Install LLVM and Clang
-      if: startsWith(matrix.os, 'windows')
-      uses: KyleMayes/install-llvm-action@v1
-      with:
-        version: "11.0"
-        directory: ${{ runner.temp }}/llvm
-    - name: Set LIBCLANG_PATH
-      if: startsWith(matrix.os, 'windows')
-      run: echo "LIBCLANG_PATH=$((gcm clang).source -replace "clang.exe")" >> $env:GITHUB_ENV
-    - name: Run tests
-      run: bash ./ci-tests.sh
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: clippy
+      - name: Install LLVM and Clang
+        if: startsWith(matrix.os, 'windows')
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: "11.0"
+          directory: ${{ runner.temp }}/llvm
+      - name: Set LIBCLANG_PATH
+        if: startsWith(matrix.os, 'windows')
+        run: echo "LIBCLANG_PATH=$((gcm clang).source -replace "clang.exe")" >> $env:GITHUB_ENV
+      - name: Run tests
+        run: bash ./ci-tests.sh

Cargo.toml

@@ -11,6 +11,7 @@ categories = ["cryptography"]
 readme = "README.md"
 keywords = ["noise", "protocol", "crypto"]
 edition = "2021"
+rust-version = "1.81"
 
 # This is slightly mumbo-jumboey, but in short:
 # Features with a -resolver suffix simply enables the existence of a specific resolver,