chore(deps-dev): bump fastify from 4.13.0 to 4.15.0 (#548)

Bumps [fastify](https://github.com/fastify/fastify) from 4.13.0 to 4.15.0.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v4.13.0...v4.15.0)

---
updated-dependencies:
- dependency-name: fastify
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]