Please update bundled libexpat to 2.4.7 with an important fix

[hartwork]

BPO	46932
Nosy	@ned-deily, @ambv, @zooba, @hartwork, @corona10, @pablogsal, @miss-islington
PRs	bpo-46932: Update bundled libexpat to 2.4.7 #31736 [3.10] bpo-46932: Update bundled libexpat to 2.4.7 (GH-31736) #31738 [3.9] bpo-46932: Update bundled libexpat to 2.4.7 (GH-31736) #31739 [3.8] bpo-46932: Update bundled libexpat to 2.4.7 (GH-31736) #31740 [3.7] bpo-46932: Update bundled libexpat to 2.4.7 (GH-31736) #31741

^{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/zooba'
closed_at = <Date 2022-03-08.13:30:31.313>
created_at = <Date 2022-03-05.18:03:18.212>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.11', 'expert-XML', '3.7', 'release-blocker']
title = 'Please update bundled libexpat to 2.4.7 with an important fix'
updated_at = <Date 2022-03-08.13:30:31.312>
user = 'https://github.com/hartwork'

bugs.python.org fields:

activity = <Date 2022-03-08.13:30:31.312>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2022-03-08.13:30:31.313>
closer = 'steve.dower'
components = ['XML']
creation = <Date 2022-03-05.18:03:18.212>
creator = 'sping'
dependencies = []
files = []
hgrepos = []
issue_num = 46932
keywords = ['patch']
message_count = 7.0
messages = ['414591', '414692', '414700', '414702', '414703', '414707', '414732']
nosy_count = 7.0
nosy_names = ['ned.deily', 'lukasz.langa', 'steve.dower', 'sping', 'corona10', 'pablogsal', 'miss-islington']
pr_nums = ['31736', '31738', '31739', '31740', '31741']
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46932'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[hartwork]

Hi!

I believe the fix documented at https://github.com/libexpat/libexpat/blob/27d5b8ba1771f916d9cfea2aac6bdac72071dc66/expat/Changes#L7-L11 is important to users of CPython. Please update bundled libexpat to 2.4.7. Thank you!

Best, Sebastian