Windows `git-upload-pack` zombies
There was a report that the Windows build of radicle-node will accumulate
git processes1.
This is likely due to us requiring to kill of the git-upload-pack process when
the Gitoxide fetch has completed.
1
https://radicle.zulipchat.com/#narrow/channel/369277-heartwood/topic/Windows.20Support/near/537774326