Bump fastify from 5.7.4 to 5.8.3

Bumps [fastify](https://github.com/fastify/fastify) from 5.7.4 to 5.8.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.7.4...v5.8.3)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.8.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]