Remove arguments from InheritanceQuerySetMixin._clone()

The `QuerySet._clone()` method has no arguments in either Django 3.2
or 4.1, so I'm assuming the arguments were necessary for a version
of Django that is no longer supported by `django-model-utils`.

model_utils/managers.py

@@ -91,7 +91,7 @@ def _chain(self, **kwargs):
  chained.__dict__.update(update)
  return chained
 
- def _clone(self, klass=None, setup=False, **kwargs):
+ def _clone(self):
  qs = super()._clone()
  for name in ['subclasses', '_annotated']:
  if hasattr(self, name):