chore: bump fastify/github-action-merge-dependabot from 3.6.3 to 3.9.1

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.6.3 to 3.9.1.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.6.3...v3.9.1)

---
updated-dependencies:
- dependency-name: fastify/github-action-merge-dependabot
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/nodejs.yml

@@ -109,6 +109,6 @@ jobs:
       pull-requests: write
       contents: write
     steps:
-      - uses: fastify/github-action-merge-dependabot@v3.6.3
+      - uses: fastify/github-action-merge-dependabot@v3.9.1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}