[requires.io] dependency update

requires · requires · commit ad440312d86d · 2021-04-05T09:50:51.000-07:00
diff --git a/tox.ini b/tox.ini
@@ -323,7 +323,7 @@ basepython = {[default]basepython}
 
 deps =
     Sphinx==3.5.3
-    sphinx-rtd-theme==0.5.1
+    sphinx-rtd-theme==0.5.2
 
 commands =
     sphinx-build                           \
