[3.11] gh-89828: Do not relay the __class__ attribute in GenericAlias (GH-93754) #93980
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list[int].class returned type, and isinstance(list[int], type)
returned True. It caused numerous problems in code that checks
isinstance(x, type).
(cherry picked from commit f9433ff)
Co-authored-by: Serhiy Storchaka [email protected]