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.
The actual cleanup parts of this are at #11444 (moved) and #11445 (moved).
To be specific, Windows XP and below are officially EOL and support for those targets may break in the future. This fact should be documented formally somewhere.