- update to 3.10.4:
* Fixed incorrect module name being generated for references to
class methods via a subclass where the subclass does not
override the method
* Fixed ``TypeError`` related to entry point iteration on
Python 3.9
* Ensured consistent support for both PySide and PyQt (v6 to
v2) on QtScheduler
* Replaced uses of the deprecated ``pkg_resources`` module with
``importlib.metadata``
* Fixed scheduling class methods like ``B.methodname`` where
the ``B`` class inherits from class ``A`` and ``methodname``
is a class method of class ``A``
* Fixed scheduler sleeping for too long (and thus jobs missing
their scheduled run times) if its wakeup cycle takes too much
time

* Dropped support for Python versions older than 3.6
- version update to 3.9.1.post1
would cause incorrect timing for a cron trigger