chore(deps-dev): bump fastify from 5.7.3 to 5.8.3 (#30)

Bumps [fastify](https://github.com/fastify/fastify) from 5.7.3 to 5.8.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.7.3...v5.8.3)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -49,7 +49,7 @@
     "@nestjs/testing": "^11.1.12",
     "@swc/cli": "^0.7.9",
     "@swc/core": "^1.15.8",
-    "fastify": "^5.7.3",
+    "fastify": "^5.8.3",
     "@types/express": "^5.0.6",
     "@types/jest": "^30.0.0",
     "@types/node": "^25.0.6",