chore(deps-dev): Bump fastify from 5.5.0 to 5.6.1 (#1107)

Bumps [fastify](https://github.com/fastify/fastify) from 5.5.0 to 5.6.1.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.5.0...v5.6.1)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.6.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]