Update dependency nuxt to v4

Author: renovate[bot]

nuxt-3/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@fluent/bundle": "^0.18.0",
     "fluent-vue": "^3.5.1",
-    "nuxt": "^3.10.3",
+    "nuxt": "^4.0.0",
     "vue": "^3.4.19",
     "vue-router": "^4.3.0"
   },