Bump fastify from 4.23.2 to 5.7.3 in /packages/api

Bumps [fastify](https://github.com/fastify/fastify) from 4.23.2 to 5.7.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v4.23.2...v5.7.3)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.7.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/api/package.json

@@ -41,7 +41,7 @@
     "emailo": "0.0.1",
     "eslint-plugin-prettier": "^5.1.3",
     "fast-jwt": "^2.2.2",
-    "fastify": "4.23.2",
+    "fastify": "5.7.3",
     "fastify-plugin": "^4.5.0",
     "fastify-raw-body": "4.2.0",
     "isomorphic-lib": "0.0.3",