Bump pascalgn/automerge-action from 0.9.0 to 0.15.2 (#182)

Author: dependabot[bot]

.github/workflows/automerge.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: automerge
-        uses: pascalgn/automerge-action@v0.9.0
+        uses: pascalgn/automerge-action@v0.15.2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           MERGE_METHOD: squash