gh-86986: bump min sphinx version to 3.2

[sorcio]

#92318 introduced changes that require a minimum Sphinx version of 3.2, so needs_sphinx needs to be updated accordingly. The change was backported to 3.11 and 3.10 so the same should apply for this PR (see also discussion in the issue #86986 (comment)).

[AA-Turner]

From the issue we might be able to bump to 3.4, but I don't know how conservative we want to be here.

A

[AA-Turner]

@sorcio please add a NEWS entry, this is relevant for redistributors.

A

[sorcio]

From the issue we might be able to bump to 3.4, but I don't know how conservative we want to be here.

Currently there are no features that need 3.4, so maybe it's not necessary. Looking at the changelog for Sphinx 3.3 and 3.4 there doesn't seem to be much of value for CPython docs anyway. If I were to guess, the next time a bump is going to be needed it's probably going to be >= 4.5. So right now 3.2 seems appropriate because it documents the minimum version that is known to work.

(Speaking of, it might be useful to point out in https://github.com/python/devguide/blob/main/documenting.rst how to find which Sphinx version to install, when not using make venv)

[miss-islington]

Thanks @sorcio for the PR, and @ambv for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-93561 is a backport of this pull request to the 3.11 branch.

[bedevere-bot]

GH-93562 is a backport of this pull request to the 3.10 branch.