Fix: Use correct rust-toolchain action name

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

Author: jmarbutt

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
           version: 9
 
       - name: Install Rust stable
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install dependencies (Ubuntu)
         if: matrix.platform == 'ubuntu-22.04'

.github/workflows/release.yml

@@ -90,7 +90,7 @@ jobs:
           version: 9
 
       - name: Install Rust stable
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.rust_target }}