FTP user authentication fails due to a date error with MySQL 8
See:
https://www.howtoforge.com/community/threads/ispconfig-and-mysql-8.85738/#post-413171
Basically, all we have to do is to remove the:
OR expires="0000-00-00 00:00:00"
from the MySQL queries. And maybe add a SQL update query to the incremental SQL file to alter all 000 dates to null, in case that there are very old installs left which use 000 in the date field.