python3-subunit: upgrade 1.4.0 -> 1.4.1

python3-subunit: upgrade 1.4.0 -> 1.4.1

Changelog:
=========
IMPROVEMENTS
-------------
* Add support for Python 3.9
* Add support for Python 3.10
* Drop support for Python 2.7, 3.4, and 3.5
* Convert python scripts to entry_points.
* Migrate CI from travis to GitHub actions.
* Add options to output filter to set timestamps.
* Remove dependency on unittest2.

BUGFIXES
----------
* Fix tests with testtools >= 2.5.0.
* Mark rawstrings as such, fixing warnings.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>