MFH: r489831 r490523

Upgrade to version 11.6.3.
For more details see here:
https://about.gitlab.com/2019/01/03/gitlab-11-6-2-released/
https://about.gitlab.com/2019/01/05/gitlab-11-6-3-released/

Approved by: mentors (implicit)

Security update to 11.6.4.

Approved by: mentors (implicit)
Security: ff50192c-19eb-11e9-8573-001b217b3468

Approved by: ports-secteam (delphij)