Update sync-dev-to-vX.Y-dev.yaml

Author: ralfhandl

.github/workflows/sync-dev-to-vX.Y-dev.yaml

@@ -24,6 +24,7 @@ jobs:
         id: pull_requests
         shell: bash
         run: |
+          git branch -r --list
           DEV_BRANCHES=$(git branch -r --list origin/v?.?-dev)
           echo "DEV_BRANCHES=$DEV_BRANCHES"
           for DEV_BRANCH in $DEV_BRANCHES; do