chore(deps-dev): bump the npm_and_yarn group across 1 directory with 2 updates

Bumps the npm_and_yarn group with 2 updates in the / directory: [fastify](https://github.com/fastify/fastify) and [flatted](https://github.com/WebReflection/flatted).


Updates `fastify` from 5.7.2 to 5.8.3
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.7.2...v5.8.3)

Updates `flatted` from 3.3.2 to 3.4.2
- [Commits](WebReflection/flatted@v3.3.2...v3.4.2)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.8.3
  dependency-type: direct:development
  dependency-group: npm_and_yarn
- dependency-name: flatted
  dependency-version: 3.4.2
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]