chore: update firebase config

Author: posva

packages/nuxt/playground/firebase.json

@@ -1,5 +1,6 @@
 {
   "functions": {
+    "runtime": "nodejs18",
     "source": ".output/server"
   },
   "hosting": {
@@ -28,10 +29,10 @@
       "host": "127.0.0.1",
       "port": 9099
     },
-    // "functions": {
-    // "host": "127.0.0.1",
-    //   "port": 5001
-    // },
+    "functions": {
+      "host": "127.0.0.1",
+      "port": 5001
+    },
     "firestore": {
       "host": "127.0.0.1",
       "port": 8080