fix(ci): add explicit toolchain input for pinned rust-toolchain

Author: nikolay-e

.github/workflows/ci.yml

@@ -86,6 +86,8 @@ jobs:
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # stable
+        with:
+          toolchain: stable
 
       - name: Cache Cargo
         uses: actions/cache@v5