Bump fastify/github-action-merge-dependabot from 3.10.1 to 3.12.0

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.10.1 to 3.12.0.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.10.1...v3.12.0)

---
updated-dependencies:
- dependency-name: fastify/github-action-merge-dependabot
  dependency-version: 3.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/build-and-test.yml

@@ -19,7 +19,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: fastify/github-action-merge-dependabot@v3.10.1
+      - uses: fastify/github-action-merge-dependabot@v3.12.0
         with:
             use-github-auto-merge: true