chore(deps): bump fastify from 5.6.2 to 5.8.3

Bumps [fastify](https://github.com/fastify/fastify) from 5.6.2 to 5.8.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.6.2...v5.8.3)

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

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

Author: dependabot[bot]

packages/domscribe-relay/package.json

@@ -29,7 +29,7 @@
     "@modelcontextprotocol/sdk": "^1.0.0",
     "cli-highlight": "^2.1.11",
     "commander": "^14.0.2",
-    "fastify": "^5.0.0",
+    "fastify": "^5.8.3",
     "fastify-type-provider-zod": "^6.1.0",
     "nanoid": "^5.0.0",
     "semver": "^7.7.4",