Bump sphinx from 3.2.0 to 3.2.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v3.2.0...v3.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -3,7 +3,7 @@
 PyYAML==5.3.1
 Pygments==2.6.1
 Sphinx-Substitution-Extensions==2020.7.4.1
-Sphinx==3.2.0
+Sphinx==3.2.1
 VWS-Python-Mock==2019.12.27.0
 VWS-Test-Fixtures==2020.8.2.0
 autoflake==1.3.1