fix(ci): correct rust-toolchain action name and add write permissions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -9,6 +9,9 @@ on:
         description: 'Release tag to build (e.g., v1.1.1)'
         required: true
 
+permissions:
+  contents: write
+
 env:
   CARGO_TERM_COLOR: always
 
@@ -38,7 +41,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Rust
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}