[3.9] bpo-41517: do not allow Enums to be extended (GH-22271) #22278
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fix bug that let Enums be extended via multiple inheritance
(cherry picked from commit 3064dbf)
Co-authored-by: Ethan Furman ethan@stoneleaf.us
https://bugs.python.org/issue41517
Automerge-Triggered-By: @ethanfurman