fix: Pin down specific stable version

Author: celinval

.github/workflows/ci.yml

@@ -23,10 +23,8 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
-        with:
-          components: clippy
+      - name: Add clippy component
+        run: rustup component add clippy
 
       - name: Cache cargo build
         uses: actions/cache@v4

rust-toolchain.toml

@@ -1,2 +1,3 @@
 [toolchain]
+channel = "1.91.1"
 components = ["llvm-tools", "rustc-dev", "rust-src"]