Bump fastify/github-action-merge-dependabot from 3.6.3 to 3.6.4 (#3169)

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.6.3 to 3.6.4.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.6.3...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pr_verification.yml

@@ -29,4 +29,4 @@ jobs:
       contents: write
 
     steps:
-      - uses: fastify/[email protected].3  
+      - uses: fastify/[email protected].4