Update GitLab to the 13.6.3 Patch Release
Adds the GitLab 13.6.3 Patch Release.
This is a regular bug-fix patch release of GitLab. New for the repo1 build, is the switch to UBI 8.3.
More information can be found at https://about.gitlab.com/releases/2020/12/10/gitlab-13-6-3-released/
/reassign @tcraise