[Python-checkins] [3.9] [Enum] update member.member removal to 3.11 (GH-29607)

[ethanfurman]

https://github.com/python/cpython/commit/41365f7dc49b758717e28a5112affe14eac93775
commit: 41365f7dc49b758717e28a5112affe14eac93775
branch: 3.9
author: Ethan Furman <ethan at stoneleaf.us>
committer: ethanfurman <ethan at stoneleaf.us>
date: 2021-11-17T23:36:01-08:00
summary:

[3.9] [Enum] update member.member removal to 3.11 (GH-29607)

Accessing one enum member from another originally raised an `AttributeError`, but became possible due to a performance boost implementation detail.  In 3.11 it will again raise an `AttributeError`.

files: