Run wpcron every 5 minutes instead

running it every minute causes a lot of churn which is probably not
needed.

CloudronManifest.json

@@ -18,7 +18,7 @@
     "ldap": {},
     "scheduler": {
       "wpcron": {
-        "schedule": "*/1 * * * *",
+        "schedule": "*/5 * * * *",
         "command": "/app/code/wp --allow-root cron event run --due-now"
       }
     }