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.
We need to bump the dependencies for Fenix 81.1.0b1 and make sure the
result still compiles and runs.
The GeckoView part is already done and handled in #40062 (closed).