Update dependency nuxt to v3 [SECURITY]

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "@nuxtjs/i18n": "^7.0.3",
     "@nuxtjs/pwa": "^3.3.5",
     "@nuxtjs/sitemap": "^2.4.0",
-    "nuxt": "^2.15.4",
+    "nuxt": "^3.0.0",
     "vue-matomo": "^4.1.0",
     "vue-mq": "^1.0.1"
   },