fix(deps): update dependency fastify-plugin to v6

Author: renovate[bot]

package.json

@@ -63,7 +63,7 @@
     "esbuild": "0.28.1",
     "fastify": "5.8.5",
     "fastify-disablecache": "5.0.0",
-    "fastify-plugin": "5.1.0",
+    "fastify-plugin": "6.0.0",
     "fastify-type-provider-zod": "6.1.0",
     "form-data": "4.0.5",
     "generate-password": "1.7.1",