build(deps): bump fastify/github-action-merge-dependabot (nodejs#2177)

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@f4fba1d...d37100b)

---
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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nodejs.yml

@@ -34,6 +34,6 @@ jobs:
       pull-requests: write
       contents: write
     steps:
-    - uses: fastify/github-action-merge-dependabot@f4fba1d411acf25f03affabc4ac209291cb9d6da # v3.8.0
+    - uses: fastify/github-action-merge-dependabot@d37100b180dfd816bb1d7e4fbb544b3c734957a1 # v3.9.0
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}