fix: update Rust action to use rust-toolchain for consistency

Author: veaba

.github/workflows/docs.yml

@@ -41,7 +41,7 @@ jobs:
         run: pnpm install --frozen-lockfile --ignore-scripts
 
       - name: Setup Rust
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install wasm-pack
         run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh