Incorrect returntype of FormMixin.get_form

[KalleDK]

Bug report

What's wrong

FormMixin's get_form says it returns in instance of BaseForm

How is that should be

It should return either an instance of the class given to the method or the class returned by get_form_class

System information

• OS:
• python version: 3.9
• django version: 3.2.9
• mypy version: -
• django-stubs version: 1.10.1
• django-stubs-ext version: 0.4.0