Bump pascalgn/automerge-action from 0.15.6 to 0.16.3

Bumps [pascalgn/automerge-action](https://github.com/pascalgn/automerge-action) from 0.15.6 to 0.16.3.
- [Release notes](https://github.com/pascalgn/automerge-action/releases)
- [Commits](pascalgn/automerge-action@v0.15.6...v0.16.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/automerge.yml

@@ -49,7 +49,7 @@ jobs:
 
     steps:
       - name: Automerging
-        uses: pascalgn/automerge-action@v0.15.6
+        uses: pascalgn/automerge-action@v0.16.3
         env:
           BASE_BRANCHES: nightly
           GITHUB_TOKEN: ${{ secrets.GH_BOT_TOKEN }}