Bump fastify/github-action-merge-dependabot from 3.0.2 to 3.1

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.0.2 to 3.1.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.0.2...v3.1)

---
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/part_dependabot.yml

@@ -14,7 +14,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: fastify/github-action-merge-dependabot@v3.0.2
+      - uses: fastify/github-action-merge-dependabot@v3.1
         with:
           github-token: ${{ github.token }}
           # Major Updates need to be merged manually