chore: bump @fastify/swagger-ui from 5.2.6 to 6.0.0 (#626)

Bumps [@fastify/swagger-ui](https://github.com/fastify/fastify-swagger-ui) from 5.2.6 to 6.0.0.
- [Release notes](https://github.com/fastify/fastify-swagger-ui/releases)
- [Commits](fastify/fastify-swagger-ui@v5.2.6...v6.0.0)

---
updated-dependencies:
- dependency-name: "@fastify/swagger-ui"
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

package.json

@@ -14,7 +14,7 @@
   },
   "devDependencies": {
     "@fastify/swagger": "^9.0.0",
-    "@fastify/swagger-ui": "^5.0.0",
+    "@fastify/swagger-ui": "^6.0.0",
     "@types/node": "^25.0.3",
     "benchmark": "^2.1.4",
     "c8": "^11.0.0",