deps: bump fastify from 5.5.0 to 5.6.0

Bumps [fastify](https://github.com/fastify/fastify) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.5.0...v5.6.0)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
     "@fastify/url-data": "^6.0.3",
     "@filecoin-station/spark-stats-db": "^1.0.0",
     "debug": "^4.4.1",
-    "fastify": "^5.5.0",
+    "fastify": "^5.6.0",
     "http-assert": "^1.5.0",
     "pg": "^8.16.3"
   },