Bump fastify/github-action-merge-dependabot from 3.14.0 to 3.15.0 (#570)

Bumps [fastify/github-action-merge-dependabot](https://github.com/fastify/github-action-merge-dependabot) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/fastify/github-action-merge-dependabot/releases)
- [Commits](fastify/github-action-merge-dependabot@v3.14.0...v3.15.0)

---
updated-dependencies:
- dependency-name: fastify/github-action-merge-dependabot
  dependency-version: 3.15.0
  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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -75,12 +75,12 @@ jobs:
           requirementsChanged:
             - 'package.json'
     - name: Merge lockfile changes
-      uses: fastify/github-action-merge-dependabot@v3.14.0
+      uses: fastify/github-action-merge-dependabot@v3.15.0
       if: steps.filter.outputs.requirementsChanged == 'false'
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Approve requirement changes
-      uses: fastify/github-action-merge-dependabot@v3.14.0
+      uses: fastify/github-action-merge-dependabot@v3.15.0
       if: steps.filter.outputs.requirementsChanged == 'true'
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}