Test suite needs adjustments for Expat >=2.4.5

[hartwork]

BPO	46811
Nosy	@ned-deily, @ambv, @mgorny, @hartwork, @miss-islington
PRs	bpo-46811: Make test suite support Expat >=2.4.5 #31453 [3.9] bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) #31469 [3.8] bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) #31470 [3.7] bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) #31471 [3.10] bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) #31472

^{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 = None
created_at = <Date 2022-02-20.19:54:05.845>
labels = ['3.8', '3.9', '3.10', '3.11', 'expert-XML', '3.7']
title = 'Test suite needs adjustments for Expat >=2.4.5'
updated_at = <Date 2022-02-22.20:58:09.013>
user = 'https://github.com/hartwork'

bugs.python.org fields:

activity = <Date 2022-02-22.20:58:09.013>
actor = 'lukasz.langa'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['XML']
creation = <Date 2022-02-20.19:54:05.845>
creator = 'sping'
dependencies = []
files = []
hgrepos = []
issue_num = 46811
keywords = ['patch']
message_count = 6.0
messages = ['413605', '413654', '413658', '413659', '413669', '413743']
nosy_count = 5.0
nosy_names = ['ned.deily', 'lukasz.langa', 'mgorny', 'sping', 'miss-islington']
pr_nums = ['31453', '31469', '31470', '31471', '31472']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46811'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[hartwork]

It has been reported at https://bugs.python.org/issue46794#msg413587 that the current CPython test suite needs some adjustments for Expat >=2.4.5. Since that is somewhat separate from updating the bundled copy of Expat to >=2.4.6, I am creating this dedicated ticket. I pull request for discussion will follow shortly.

[ambv]

New changeset 2cae938 by Sebastian Pipping in branch 'main':
bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453)
2cae938

[ambv]

New changeset 7da97f6 by Miss Islington (bot) in branch '3.10':
bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) (GH-31472)
7da97f6