Use github cli to sync master back to development

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/workflows/sync-back-to-dev.yml

@@ -11,17 +11,8 @@ jobs:
     name: Syncing branches
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v3.1.0
       - name: Opening pull request
-        id: pull
-        uses: tretuna/sync-branches@1.4.0
-        with:
+        run: gh pr create -B dev -H master --title 'Sync master back into development' --body 'Created by Github action' --label 'internal'
+        env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          FROM_BRANCH: 'master'
-          TO_BRANCH: 'dev'
-      - name: Label the pull request to ignore for release note generation
-        uses: actions-ecosystem/action-add-labels@v1
-        with:
-          labels: internal
-          repo: ${{ github.repository }}
-          number: ${{ steps.pull.outputs.PULL_REQUEST_NUMBER }}