Update pascalgn/automerge-action action to v0.16.4

Author: renovate[bot]

.github/workflows/automerge.yml

@@ -27,7 +27,7 @@ jobs:
         env:
           GITHUB_TOKEN: "${{ secrets.AUTH_TOKEN }}"
       - name: 'Merge'
-        uses: "pascalgn/[email protected].3"
+        uses: "pascalgn/[email protected].4"
         if: steps.waitforstatuschecks.outputs.status == 'success'
         env:
           GITHUB_TOKEN: "${{ secrets.AUTH_TOKEN }}"