Update pull request workflow for license checks

.github/workflows/pull_request.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Escape dollar signs in licenses
       run: |
         sed -i 's/\$/\\$/g' lib/presentation/views/about/licenses/oss_licenses.dart
-    
+  
     - name: Check for changes
       id: check_changes
       run: |
@@ -35,11 +35,12 @@ jobs:
         else
           echo "changes_detected=false" >> $GITHUB_OUTPUT
         fi
-
+    
     - 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