Enum: revert to 3.9

ethanfurman

BPO	44559
Nosy	@Yhg1s, @warsaw, @brettcannon, @pitrou, @ethanfurman, @willingc, @pablogsal
PRs	[3.10] bpo-44559: [Enum] revert str repr #27010 [3.10] bpo-44559: [Enum] add news entry for enum module reversion #27099 bpo-44559: [Enum] Correct `versionadded` to 3.11 for new features #27388 [3.10] bpo-44559: [Enum] restore fixes lost in 3.10 -> 3.9 reversion #29114

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ethanfurman'
closed_at = <Date 2021-11-13.19:06:16.033>
created_at = <Date 2021-07-04.01:48:24.713>
labels = ['library', '3.10', 'release-blocker']
title = 'Enum: revert to 3.9'
updated_at = <Date 2021-11-13.19:06:16.032>
user = 'https://github.com/ethanfurman'

bugs.python.org fields:

activity = <Date 2021-11-13.19:06:16.032>
actor = 'ethan.furman'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2021-11-13.19:06:16.033>
closer = 'ethan.furman'
components = ['Library (Lib)']
creation = <Date 2021-07-04.01:48:24.713>
creator = 'ethan.furman'
dependencies = []
files = []
hgrepos = []
issue_num = 44559
keywords = ['patch']
message_count = 6.0
messages = ['396935', '396937', '398303', '403863', '403876', '404563']
nosy_count = 8.0
nosy_names = ['twouters', 'barry', 'brett.cannon', 'pitrou', 'ethan.furman', 'python-dev', 'willingc', 'pablogsal']
pr_nums = ['27010', '27099', '27388', '29114']
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue44559'
versions = ['Python 3.10']