Merge pull request #881 from VWS-Python/dependabot/pip/sphinx-3.5.3

Bump sphinx from 3.5.2 to 3.5.3

Author: adamtheturtle

dev-requirements.txt

@@ -1,6 +1,6 @@
 PyYAML==5.4.1
 Sphinx-Substitution-Extensions==2020.9.30.0
-Sphinx==3.5.2
+Sphinx==3.5.3
 VWS-Test-Fixtures==2020.9.25.1
 autoflake==1.4
 black==20.8b1