update codestyle.yaml

Author: CppCXY

.github/workflows/codestyle.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
         with:
-          ref: ${{ github.event.pull_request.head.sha }}
+          ref: ${{ github.event.pull_request.head.ref }}
       - name: Clang Format Checker
       - uses: jidicula/[email protected]
         with: