chore: bumped v4.0.0

Signed-off-by: Matteo Collina <hello@matteocollina.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mercuriusjs/federation",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "A plugin for mercurius federation",
   "main": "index.js",
   "types": "index.d.ts",
@@ -42,7 +42,7 @@
     "@graphql-tools/utils": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^5.43.0",
     "@typescript-eslint/parser": "^5.43.0",
-    "fastify": "^4.17.0",
+    "fastify": "^5.0.0-alpha.4",
     "graphql-tag": "^2.12.6",
     "graphql-ws": "^5.11.2",
     "husky": "^9.0.7",
@@ -61,8 +61,8 @@
     "*.{js,jsx}": "standard --cache --fix"
   },
   "dependencies": {
-    "@fastify/error": "^3.0.0",
+    "@fastify/error": "^4.0.0",
     "graphql": "^16.6.0",
-    "mercurius": "^14.0.0"
+    "mercurius": "^15.0.0"
   }
 }