fix(ci): fmt

Author: fundon

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: dtolnay/rust-toolchain@stable
       - run: cargo fmt --all -- --check
 
   docs: