Introduced in version 10.20241031 that broke cloning from a special remote
retrieveKeyFile changed to use createAnnexDirectory, which means that the
path passed to it needs to be under .git
git-remote-annex is probably the only thing in git-annex where that was not
the case. And there's no real reason it cannot be the case with it either.
Just use withOtherTmp.
