Pin CI Rust version (#3763)

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.77.0
       - uses: Swatinem/rust-cache@v2
       - run: cargo test --workspace --no-fail-fast
 
@@ -38,7 +38,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@1.77.0
+        with:
+          components: clippy, rustfmt
       - uses: Swatinem/rust-cache@v2
       - run: cargo clippy --workspace --all-targets --all-features
       - run: cargo fmt --check --all

.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@1.77.0
       with:
         target: ${{ matrix.target }}