Bump pascalgn/automerge-action from 0.15.2 to 0.15.3 (#13)

Author: dependabot[bot]

.github/workflows/automerge.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: automerge
-        uses: "pascalgn/automerge-action@v0.15.2"
+        uses: "pascalgn/automerge-action@v0.15.3"
         env:
           GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
           MERGE_METHOD: squash