chore(deps): update pascalgn/automerge-action action to v0.15.6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: automerge
-      uses: pascalgn/automerge-action@v0.15.5
+      uses: pascalgn/automerge-action@v0.15.6
       env:
         GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
         MERGE_LABELS: ""