chore(playground): update nuxt version

Author: atinux

playground/package.json

@@ -14,7 +14,7 @@
     "@tsndr/cloudflare-worker-jwt": "^3.1.3",
     "@vueuse/core": "^12.5.0",
     "@vueuse/nuxt": "^12.5.0",
-    "nuxt": "^3.15.2",
+    "nuxt": "^3.15.4",
     "nuxt-auth-utils": "latest",
     "zod": "^3.24.1"
   },