Log Message:
mail/roundcube: update to 1.2.8

This is a security update to the stable version 1.2.  It fixes a recently
reported vulnerability allowing IMAP command injection via a GET parameters.
More details about this are published under CVE-2018-9846.

The second fix is about a missed remote content blocking on HTML messages with
specially crafted image and style tags.

We strongly recommend to update all productive installations of Roundcube
1.2.x.  Please do backup your data before updating!

CHANGELOG

* Fix check_request() bypass in places using get_uids() [CVE-2018-9846]
  (#6238)

* Fix possible IMAP command injection vulnerability [CVE-2018-9846] (#6229)

* Fix security issue in remote content blocking on HTML image and style tags
  (#6178)