Add ref

Author: mykola-mokhnach

.github/workflows/lock-update.yml

@@ -18,6 +18,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ref: ${{ github.head_ref }}
       - name: Set up Python
         uses: actions/setup-python@v4
         with: