Remove gitpython requirement
Closes #1293 (closed), and !1812 (closed) since we don't need to bump something we don't have anymore.
I was wondering why we still needed gitpython
in the backend when we do Git imports via tasks. Turns out we don't need it anymore since May of 2020, when all uses of gitpython
were removed, in #225 (closed).
Edited by Erwan Rouchet