- update to 2.7.1:
* Remove various unused imports.
* Fix build backend. This should prevent version from being set
when building wheels.
* Fix compatibility with Python 3.12.
* Add typing in various modules (still lacking full coverage).
* Drop the 'test' command for distutils. This has been
deprecated since 2.6.0. (Jelmer Vernooij)
* Drop support for Python 3.6.

- remove python-testtools-no-unittest2.patch (upstream)
- BuildRequires also using extras>=1.0.0
- fix typo in last change
supposed to do just that.
- add python-mmimeparse dependency
* testtools.run discover will now sort the tests it discovered. This is a
fixes testr run of streams containing progress markers (by discarding the