chore(deps): replace dependency fastify-formbody with @fastify/formbo…

…dy 6.0.0

package.json

@@ -56,7 +56,7 @@
     "eslint-config-prettier": "9.1.0",
     "eslint-plugin-prettier": "5.1.3",
     "fastify": "4.27.0",
-    "fastify-formbody": "5.3.0",
+    "@fastify/formbody": "6.0.0",
     "globals": "15.8.0",
     "npm-run-all2": "5.0.2",
     "prettier": "3.3.2",