Update GitHub Actions to use latest stable Rust and add rust-toolchain.toml

Co-authored-by: 0xrinegade <[email protected]>

Author: Copilot

.github/workflows/benchmarks.yml

@@ -17,7 +17,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Install Rust
-      uses: actions-rs/toolchain@v1
+      uses: dtolnay/rust-toolchain@stable
       with:
         toolchain: stable
         override: true

.github/workflows/ci.yml

@@ -63,6 +63,7 @@ jobs:
         with:
           profile: minimal
           toolchain: stable
+      
       - name: Cache dependencies
         uses: actions/cache@v4
         with:

rust-toolchain.toml

@@ -0,0 +1,4 @@
+[toolchain]
+channel = "stable"
+components = ["rustfmt", "clippy"]
+targets = ["x86_64-unknown-linux-gnu", "x86_64-apple-darwin", "x86_64-pc-windows-gnu"]