chore(deps): update nuxt to v4

Author: renovate[bot]

package.json

@@ -43,13 +43,13 @@
     "test:types": "vue-tsc --noEmit && cd playground && vue-tsc --noEmit"
   },
   "dependencies": {
-    "@nuxt/kit": "^3.17.7"
+    "@nuxt/kit": "^4.2.1"
   },
   "devDependencies": {
     "@nuxt/devtools": "^2.6.2",
     "@nuxt/eslint-config": "^1.5.2",
     "@nuxt/module-builder": "^1.0.1",
-    "@nuxt/schema": "^3.17.7",
+    "@nuxt/schema": "^4.2.1",
     "@nuxt/test-utils": "^3.19.2",
     "@types/node": "^22.16.4",
     "@vue/test-utils": "^2.4.6",