[Pkg-telepathy-maintainers] Bug#938639: telepathy-haze: Python2 removal in sid/bullseye

[Arek]

I submitted a pull request upstream:
https://gitlab.freedesktop.org/telepathy/telepathy-haze/-/merge_requests/1

Please note that the tests only work if twisted library is patched with
the following tiny changeset:
https://github.com/twisted/twisted/pull/1145/files

This should be enough to bring back support for telepathy-haze.