chore(deps-dev): bump fastify in the dependencies group (#2141)

Bumps the dependencies group with 1 update: [fastify](https://github.com/fastify/fastify).


Updates `fastify` from 5.4.0 to 5.5.0
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.4.0...v5.5.0)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.5.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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Author: dependabot[bot]