expire_logs_days not supported under MySQL 8.2+

[wordpress](https://github.com/lando/wordpress/tree/main)/[config](https://github.com/lando/wordpress/tree/main/config)
/mysql8.cnf:51 sets `expire_logs_days = 10`. 

However, this variable was removed in 8.2 and throws an error causing the container to abort. 

It is replaced by `binlog_expire_logs_seconds = 864000`