Sync vendored typeshed stubs

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[AlexWaygood]

Two changes to our tests were required:

• Add types.ModuleType.__doc__ python/typeshed#12918 means that we now understand that __doc__ is present in the global namespace of all modules (good!)

• naming and inheritance for importlib python/typeshed#12775 means that we no longer understand what the type of types.ModuleType.__spec__ is (bad!).

  This is because typeshed annotates types.ModuleType.__spec__ as ModuleSpec | None in types.pyi, and ModuleSpec is imported from importlib.machinery in types.pyi, and importlib/machinery.pyi now re-exports ModuleSpec from importlib._bootstrap, and importlib/_bootstrap.pyi re-exports ModuleSpec from _frozen_importlib via a * import, and we don't understand * imports yet.

  I'm not sure it's absolutely necessary for the stubs to have quite so much indirection here... but that's a conversation we'd have to have over at typeshed. Whatever the case, even if there are no changes at typeshed, we should fix this regression in type inference naturally when we add support for * imports.

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