[ci][docs] Restrict Sphinx version (#4267)

a421217e · Nikita Titov · GitHub · f8318088 · a421217e
Unverified Commit a421217e authored May 09, 2021 by Nikita Titov Committed by GitHub May 09, 2021
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docs/requirements_base.txt docs/requirements_base.txt +1 -1

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--- a/docs/requirements_base.txt
+++ b/docs/requirements_base.txt
-sphinx
+sphinx < 4
 sphinx_rtd_theme >= 0.5