Update generate-release-notes.yml

Author: anupriya13

.github/workflows/generate-release-notes.yml

@@ -16,9 +16,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          repository: ${{ github.repository_owner }}/react-native-windows
           fetch-depth: 0
-          ref: ${{ github.head_ref != '' && github.head_ref || github.ref_name }}
+          ref: ${{ github.event.pull_request.head.ref || github.ref_name }}
 
       - name: Set up Python
         uses: actions/setup-python@v4