[requires.io] dependency update

requires · requires · commit 6ea21a7324dd · 2021-02-14T00:24:04.000-08:00
diff --git a/tox.ini b/tox.ini
@@ -322,7 +322,7 @@ description = build documentation
 basepython = {[default]basepython}
 
 deps =
-    Sphinx==3.4.3
+    Sphinx==3.5.0
     sphinx-rtd-theme==0.5.1
 
 commands =
