Bump pascalgn/automerge-action from 0.16.3 to 0.16.4

Bumps [pascalgn/automerge-action](https://github.com/pascalgn/automerge-action) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/pascalgn/automerge-action/releases)
- [Commits](pascalgn/automerge-action@v0.16.3...v0.16.4)

---
updated-dependencies:
- dependency-name: pascalgn/automerge-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 1a9f9d0)

.github/workflows/automerge.yaml

@@ -103,7 +103,7 @@ jobs:
 
       - id: automerge
         name: Auto merge of cherry-picked PRs.
-        uses: pascalgn/automerge-action@v0.16.3
+        uses: pascalgn/automerge-action@v0.16.4
         if: steps.waitforstatuschecks.outputs.status == 'success'
         env:
           GITHUB_TOKEN: "${{ secrets.CHERRYPICK_PAT }}"