MFH: r487429
Security update to 11.5.4.
See here for more details:
https://about.gitlab.com/2018/12/13/critical-security-release-gitlab-11-dot-5-dot-4-released/
Approved by: mentors (implicit)
Security: 757e6ee8-ff91-11e8-a148-001b217b3468
Approved by: ports-secteam (miwi)