Update pull request workflow for license checks

.github/workflows/pull_request.yml

@@ -39,7 +39,8 @@ jobs:
     - name: Checkout PR branch
       if: steps.check_changes.outputs.changes_detected == 'true'
       run: |
-        git checkout ${{ github.head_ref }}
+        git fetch origin pull/${{ github.event.pull_request.number }}/head:${{ github.event.pull_request.head.ref }}
+        git checkout ${{ github.event.pull_request.head.ref }}
     
     - name: Commit Changes
       if: steps.check_changes.outputs.changes_detected == 'true'
@@ -48,8 +49,7 @@ jobs:
         git config --global user.email "actions@github.com"
         git add .
         git commit -m "Actions: Licenses updated [skip ci]"
-        git push
-
+        git push origin HEAD:${{ github.event.pull_request.head.ref }}
 
   lint:
     runs-on: ubuntu-latest