chore(deps): bump fastify from 3.29.5 to 5.7.3

Bumps [fastify](https://github.com/fastify/fastify) from 3.29.5 to 5.7.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v3.29.5...v5.7.3)

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

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

Author: dependabot[bot]

packages/_example/package.json

@@ -19,7 +19,7 @@
     "@nestjs/platform-fastify": "^10.4.16",
     "dotenv": "^16.0.3",
     "express": "^4.18.2",
-    "fastify": "^3.29.0",
+    "fastify": "^5.7.3",
     "fastify2": "npm:fastify@^2.15.3",
     "fastify4": "npm:fastify@^4.29.0",
     "koa": "^3.0.1",

packages/agent/package.json

@@ -61,7 +61,7 @@
     "@types/koa__cors": "^3.3.0",
     "@types/superagent": "^8.1.9",
     "express": "^4.18.2",
-    "fastify": "^3.29.0",
+    "fastify": "^5.7.3",
     "fastify2": "npm:fastify@^2.15.3",
     "fastify4": "npm:fastify@^4.28.0",
     "openid-client": "^5.7.1",