GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
Mike mentioned this on IRC:
10:31 < mikeperry> boklm,GeKo: yes, you should both open tickets for vescum access
GeKo opened ticket #13257 (moved) and I'm opening this ticket.
The access to vescum is needed to update files on https://www.torproject.org/dist/torbrowser/ for new releases.