Bump fastify from 1.14.6 to 2.15.1

Bumps [fastify](https://github.com/fastify/fastify) from 1.14.6 to 2.15.1.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v1.14.6...v2.15.1)

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

Author: dependabot[bot]