BUG: Temporarily pin the version of Sphinx to 3.3.1 in requirements. #38598
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A recent change in Sphinx v3.4.0 is breaking pandas' CI Build documentation step.
Until this is resolved, we can temporarily pin Sphinx to the previous version (3.3.1).
Submitted in response to @jreback in #38593 (comment)
Here's some info that might help for getting this sorted, long term:
Sphinx Changelog: Release 3.4.0 (released Dec 20, 2020)
https://www.sphinx-doc.org/en/master/changes.html#release-3-4-0-released-dec-20-2020
CI build logs from some passing and failing builds:
While passing and failing builds both emit warnings, the following warnings are exclusive to the failing builds under Sphinx 3.4.0: