fix(deps): update nuxtjs monorepo to v4

Author: renovate[bot]

package.json

@@ -32,14 +32,14 @@
   "dependencies": {
     "@gouvfr/dsfr": "^1.13.0",
     "@gouvminint/vue-dsfr": "^8.2.1",
-    "@nuxt/kit": "^3.12.4",
+    "@nuxt/kit": "^4.0.0",
     "defu": "~6.1.4"
   },
   "devDependencies": {
     "@nuxt/devtools": "^1.1.5",
     "@nuxt/eslint-config": "^0.5.0",
     "@nuxt/module-builder": "^0.8.0",
-    "@nuxt/schema": "^3.12.4",
+    "@nuxt/schema": "^4.0.0",
     "@nuxt/test-utils": "^3.12.4",
     "@socialgouv/eslint-config-recommended": "^1.131.0",
     "@types/node": "^22.0.0",