Fix unused code that causes workflow to fail (#16827)

* Remove unused code that causes workflow to fail


Co-authored-by: Chiedo <chiedo@users.noreply.github.com>

.github/workflows/repo-sync-stalls.yml

@@ -16,9 +16,6 @@ jobs:
   repo-sync-stalls:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
-        with:
-          ref: repo-sync
       - name: Check if repo sync is stalled
         uses: actions/github-script@626af12fe9a53dc2972b48385e7fe7dec79145c9
         with: