Update continous-integration.yml

Author: tmbo

.github/workflows/continous-integration.yml

@@ -268,6 +268,6 @@ jobs:
     needs: [quality, test, api, docker]
     steps:
       - uses: actions/checkout@v1
-      - uses: rasahq/merge-pal-action
+      - uses: rasahq/merge-pal-action@master
         with:
           token: ${{ secrets.RASABOT_AUTOMERGE_GITHUB_TOKEN }}