Adjust update cron to query server status

[altNightHawk]

Use https://servers.exfil-stats.de/ to check if anyone is on the server before rebooting for an update.

[JensAtQuanos]

Its better to use: https://serverquery.exfil-stats.de
And dont fogett, that data is cached, so it may be 20-30 seconds old.

[altNightHawk]

that data is not working at this time, need to find another solution