escape4chm.py script causing AttributeError in docs build

[zooba]

BPO	46463
Nosy	@zooba, @miss-islington
PRs	bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file #30768 [3.9] bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file (GH-30768) #30772 [3.10] bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file (GH-30768) #30773

^{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 2022-01-24.14:20:56.532>
created_at = <Date 2022-01-21.20:17:55.188>
labels = ['3.11', 'build', 'docs']
title = 'escape4chm.py script causing AttributeError in docs build'
updated_at = <Date 2022-01-24.14:20:56.531>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2022-01-24.14:20:56.531>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2022-01-24.14:20:56.532>
closer = 'steve.dower'
components = ['Build', 'Documentation']
creation = <Date 2022-01-21.20:17:55.188>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 46463
keywords = ['patch']
message_count = 4.0
messages = ['411180', '411192', '411198', '411199']
nosy_count = 2.0
nosy_names = ['steve.dower', 'miss-islington']
pr_nums = ['30768', '30772', '30773']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue46463'
versions = ['Python 3.11']

[zooba]

Exception occurred:
File "D:\a\1\s\Doc\tools\extensions\escape4chm.py", line 44, in fixup_keywords
with app.builder.open_file(outdir, outname + '.hhk', 'r') as f:
AttributeError: 'HTMLHelpBuilder' object has no attribute 'open_file'
The full traceback has been saved in C:\Users\VSSADM~1\AppData\Local\Temp\sphinx-err-9ikx8s0b.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues\>. Thanks!

[zooba]

New changeset 57d1855 by Steve Dower in branch 'main':
bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file (GH-30768)
57d1855

[miss-islington]

New changeset d548c87 by Miss Islington (bot) in branch '3.10':
bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file (GH-30768)
d548c87

[miss-islington]

New changeset b37f3e9 by Miss Islington (bot) in branch '3.9':
bpo-46463: Fixes escape4chm.py script used when building the CHM documentation file (GH-30768)
b37f3e9