Fix: Use rm -f instead of mv for removing toolchain file

Use rm -f to safely remove the rust-toolchain.toml file without failing if it doesn't exist.

Co-authored-by: doitian <[email protected]>

Author: Copilot

.github/workflows/wasm.yml

@@ -13,6 +13,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Remove toolchain file to use latest stable
+        run: rm -f rust-toolchain.toml
+
       - name: Install rust
         uses: dtolnay/rust-toolchain@stable