chore(deps): replace dependency fastify-formbody with @fastify/formbody 6.0.0

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "@semantic-release/git": "10.0.1",
     "eslint": "9.6.0",
     "fastify": "4.28.1",
-    "fastify-formbody": "5.3.0",
+    "@fastify/formbody": "6.0.0",
     "npm-run-all2": "6.2.3",
     "prettier": "3.3.2",
     "semantic-release": "22.0.12",