chore(deps-dev): bump fastify from 3.8.0 to 3.9.1 (#38)

Bumps [fastify](https://github.com/fastify/fastify) from 3.8.0 to 3.9.1.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v3.8.0...v3.9.1)

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