👷 Fix notify translations checkout target (#15933)

.github/workflows/notify-translations.yml

@@ -32,6 +32,7 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
+          ref: ${{ github.event.repository.default_branch }}
           persist-credentials: false
       - name: Set up Python
         uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0