Upgrade Sphinx used by Read the Docs #509
Merged
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The docs build failure in #508 / https://readthedocs.org/projects/tablib/builds/15132767/ is likely due to using an old version of Sphinx (1.8.5; Mar 10, 2019) which isn't compatible with the new docutils 0.18 release.
The newest Sphinx (4.2.0; Sep 12, 2021) isn't either, but it pins to a compatible docutils.
See sphinx-doc/sphinx#9727.
Creating a draft PR: we might need to iterate in case we need to specify extra requirements.Ready!