• www/groupoffice: Update from 6.2.39 to 6.2.40

-Changelog:
*Files: Fixed issue that file handlers where always displayed, also when the user didn't have rights to the module the filehandler was added from.
*Billing: Undo custom fields to billing items
*Billing: add custom fields to billing items
*Core: Fixed some issues when using PHP 7.1
*Defaultsite/Tickets: Added password expire feature to the external ticket website.
*Z-Push install defaults to 2.3.6

Approved by: miwi (mentor)
Differential Revision: https://reviews.freebsd.org/D11073