defusedexpat not supported past python 3.3/3.4

[AviKelman]

BPO	38585
Nosy	@tiran, @Mariatta, @ZackerySpytz, @miss-islington
PRs	bpo-38585: Remove references to defusedexpat #22095 [3.8] bpo-38585: Remove references to defusedexpat (GH-22095) #22099 [3.9] bpo-38585: Remove references to defusedexpat (GH-22095) #22100

^{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 = None
closed_at = <Date 2020-09-06.01:33:59.342>
created_at = <Date 2019-10-24.14:45:42.380>
labels = ['3.8', 'type-bug', '3.7', '3.9', 'docs']
title = 'defusedexpat not supported past python 3.3/3.4'
updated_at = <Date 2020-09-06.01:33:59.337>
user = 'https://bugs.python.org/AviKelman'

bugs.python.org fields:

activity = <Date 2020-09-06.01:33:59.337>
actor = 'Mariatta'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-09-06.01:33:59.342>
closer = 'Mariatta'
components = ['Documentation']
creation = <Date 2019-10-24.14:45:42.380>
creator = 'Avi Kelman'
dependencies = []
files = []
hgrepos = []
issue_num = 38585
keywords = ['patch']
message_count = 5.0
messages = ['355337', '376403', '376406', '376407', '376451']
nosy_count = 6.0
nosy_names = ['christian.heimes', 'docs@python', 'Mariatta', 'ZackerySpytz', 'miss-islington', 'Avi Kelman']
pr_nums = ['22095', '22099', '22100']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38585'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']

[AviKelman]

https://docs.python.org/3/library/xml.html continues to recommend defusedexpat, but that package won't install for any Python versions after 3.4 because the package isn't being maintained. https://bitbucket.org/tiran/defusedexpat/src/default/ linked from https://pypi.org/project/defusedexpat/ stops at 3.3. https://github.com/tiran/defusedexpat stops at 3.4.

If the package doesn't actually work for newer Pythons, the recommendation should be removed from official documentation.

[miss-islington]

New changeset 51b84f8 by Zackery Spytz in branch 'master':
bpo-38585: Remove references to defusedexpat (GH-22095)
51b84f8

[miss-islington]

New changeset 6386e86 by Miss Islington (bot) in branch '3.9':
bpo-38585: Remove references to defusedexpat (GH-22095)
6386e86

[miss-islington]

New changeset 1470c91 by Miss Islington (bot) in branch '3.8':
bpo-38585: Remove references to defusedexpat (GH-22095)
1470c91

[Mariatta]

Thanks for the report and thanks Zackery for the PR.