[3.11] gh-103479: [Enum] require __new__ to be considered a data type (GH-103495) #103514
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a mixin must have a new method to be interpreted as a data-type, an init method is not enough (restores pre-3.11 behavior)
(cherry picked from commit a6f9594)
Co-authored-by: Ethan Furman ethan@stoneleaf.us
Enum
class as of 3.11 #103479