devel/py-apscheduler: unbreak with python < 3.10 after b7427cd82ccf

$ make test
[...]
ImportError while loading conftest 'APScheduler-3.10.2/tests/conftest.py'.
tests/conftest.py:8: in <module>

from apscheduler.schedulers.base import BaseScheduler

apscheduler/schedulers/base.py:46: in <module>

class BaseScheduler(six.with_metaclass(ABCMeta)):

apscheduler/schedulers/base.py:75: in BaseScheduler

_trigger_plugins = {ep.name: ep for ep in entry_points(group='apscheduler.triggers')}

E TypeError: entry_points() got an unexpected keyword argument 'group'