chore(deps-dev): bump fastify from 5.7.2 to 5.8.3

Bumps [fastify](https://github.com/fastify/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)

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

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

Author: dependabot[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "@nestjs/testing": "^11.1.13",
     "@swc/cli": "^0.7.10",
     "@swc/core": "^1.15.11",
-    "fastify": "^5.7.2",
+    "fastify": "^5.8.3",
     "@types/express": "^5.0.6",
     "@types/jest": "^30.0.0",
     "@types/node": "^25.1.0",