Bump fastify/github-action-merge-dependabot from 3.6.2 to 3.6.4 (#926)

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.6.2 to 3.6.4.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.6.2...v3.6.4)

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

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

.github/workflows/CI.yml

@@ -95,7 +95,7 @@ jobs:
       pull-requests: write
       contents: write
     steps:
-      - uses: fastify/github-action-merge-dependabot@v3.6.2
+      - uses: fastify/github-action-merge-dependabot@v3.6.4
         with:
           github-token: ${{secrets.PA_TOKEN}}