fix: arg sent to wrong step

.github/workflows/lint.yml

@@ -14,11 +14,12 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
     - name: Set up Python 3.10
       uses: actions/setup-python@v4
       with:
         python-version: '3.10'
-        ref: ${{ github.event.pull_request.head.sha }}
     - name: Lint with flake8 and Reformat with black
       run: |
         make init-lint-and-black