Solution from gh#python/cpython#13236 unnecessarily binds building of documentation to the latest version of Sphinx

[mcepl]

BPO	42579
Nosy	@mcepl, @JulienPalard, @pablogsal
PRs	bpo-42579: Make workaround for various versions of Sphinx more robust #23662

^{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 2020-12-07.20:05:37.788>
created_at = <Date 2020-12-05.21:47:14.833>
labels = ['3.7', '3.8', '3.9', '3.10', 'docs']
title = 'Solution from gh#python/cpython#13236 unnecessarily binds building of documentation to the latest version of Sphinx'
updated_at = <Date 2020-12-07.20:05:42.245>
user = 'https://github.com/mcepl'

bugs.python.org fields:

activity = <Date 2020-12-07.20:05:42.245>
actor = 'pablogsal'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-12-07.20:05:37.788>
closer = 'pablogsal'
components = ['Documentation']
creation = <Date 2020-12-05.21:47:14.833>
creator = 'mcepl'
dependencies = []
files = []
hgrepos = []
issue_num = 42579
keywords = ['patch']
message_count = 2.0
messages = ['382585', '382677']
nosy_count = 4.0
nosy_names = ['mcepl', 'docs@python', 'mdk', 'pablogsal']
pr_nums = ['23662']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42579'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[mcepl]

I think the solution in gh##13236 is the suboptimal one, because it makes Python dependent on the latest version of Sphinx unnecessarily. There are many situations where Python can be built on the older platform and it is too bothersome to require update of Sphinx (and all its dependencies) as well.

[pablogsal]

New changeset b63a620 by Matěj Cepl in branch 'master':
bpo-42579: Make workaround for various versions of Sphinx more robust (GH-23662)
b63a620