MFH: r485436
Security update to 11.4.7.
For detailed changelog see:
https://about.gitlab.com/2018/11/19/critical-security-release-gitlab-11-dot-4-dot-6-released/
Approved by: mentors (implicit)
MFC after: 1 day
Security: d889d32c-ecd9-11e8-9416-001b217b3468
Approved by: ports-secteam (miwi)