[ci][docs] Unpin Sphinx version (#4277)

This reverts commit a421217e.

[ci][docs] Unpin Sphinx version (#4277)
This reverts commit a421217e.
0a172d9e · Nikita Titov · GitHub · 08d1ce4b · 0a172d9e
Unverified Commit 0a172d9e authored May 12, 2021 by Nikita Titov Committed by GitHub May 12, 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 < 4
+sphinx
 sphinx_rtd_theme >= 0.5