Bump pascalgn/automerge-action from 0.16.3 to 0.16.4 (#991)

Author: dependabot[bot]

.github/workflows/automerge.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: automerge
-        uses: "pascalgn/[email protected].3"
+        uses: "pascalgn/[email protected].4"
         env:
           GITHUB_TOKEN: "${{ secrets.PAT }}"
           MERGE_LABELS: "approved,auto merge,!ready to review"