fix(ee): increase max allowed duration of export-subscriptions endpoint

Author: absorbb

webapps/ee-api/vercel.json

@@ -2,7 +2,7 @@
   "crons": [
     {
       "path": "/api/billing/export-subscriptions",
-      "schedule": "*/10 * * * *"
+      "schedule": "*/5 * * * *"
     }
   ]
 }