Django PostGIS models don't seem to have a `models_module` available

[Viicos]

model._meta.app_config.models_module seems to be None for these models, making the following code failing:

django-autotyping/src/django_autotyping/stubbing/django_context/django_context.py

Lines 40 to 48 in 35a984b

	def model_imports(self) -> list[ImportItem]:
	"""A list of `ImportItem` instances.
	Can be used to easily import all models in a stub file.
	"""
	return [
	ImportItem(
	module_name=model._meta.app_config.models_module.__name__,