fix: Update Rust toolchain action reference in CI workflow

Author: zibo-chen

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-action@nightly
+        uses: dtolnay/rust-toolchain@nightly
 
       - name: Install Linux dependencies
         if: runner.os == 'Linux'
@@ -75,7 +75,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-action@nightly
+        uses: dtolnay/rust-toolchain@nightly
         with:
           targets: ${{ matrix.target }}