TYP: change type annotation for `__array_namespace__` to ModuleType
TYP: change type annotation for `__array_namespace__` to ModuleType

This is more precise, we are returning a module here. Type checkers
will be able to use this info in the future - see
https://github.com/data-apis/array-api/issues/267

cupy/cupy,cupy/cupy,cupy/cupy,cupy/cupy