chore(deps-dev): bump fastify from 5.3.0 to 5.3.1

Bumps [fastify](https://github.com/fastify/fastify) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.3.0...v5.3.1)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.3.1
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]