chore(deps-dev): bump fastify from 5.3.0 to 5.3.1 (#2056)

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
...

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