pin toolchain to nightly-2024-06-21

See rust-lang/rust#126552

.github/workflows/ci.yml

@@ -15,18 +15,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@nightly
-      with:
-        components: rustfmt
     - run: cargo fmt --all -- --check
 
   clippy:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@nightly
-      with:
-        components: clippy
     - run: cargo clippy --all-targets --all-features -- -D warnings
 
   audit:
@@ -72,9 +66,6 @@ jobs:
         sanitizer: [address, leak, memory, thread]
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@nightly
-      with:
-        components: rust-src
     - run: cargo test --tests --all-features --workspace --target x86_64-unknown-linux-gnu -Zbuild-std -Zunstable-options --config='build.rustflags = ["-Zsanitizer=${{ matrix.sanitizer }}"]' -- --test-threads=1
       env:
         CC: "clang"
@@ -113,9 +104,6 @@ jobs:
           target: x86_64-apple-darwin
     steps:
     - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@nightly
-      with:
-        components: rust-src
         targets: ${{ matrix.target }}
     - run: sudo apt install -y musl-tools
       if: runner.os == 'Linux'

rust-toolchain.toml

@@ -1,2 +1,3 @@
 [toolchain]
-channel = "nightly"
+channel = "nightly-2024-06-21"
+components = ["rust-src"]