Switch Windows builds to Debian Buster
We should move from Debian Stretch to Debian Buster for our Windows builds.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information
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 should move from Debian Stretch to Debian Buster for our Windows builds.