Merge pull request #1020 from VWS-Python/dependabot/pip/requirements/black-21.12b0

Bump black from 21.11b1 to 21.12b0 in /requirements

Author: adamtheturtle

requirements/dev-requirements.txt

@@ -3,7 +3,7 @@ Sphinx-Substitution-Extensions==2020.9.30.0
 Sphinx==4.3.1
 VWS-Test-Fixtures==2021.11.5.1
 autoflake==1.4
-black==21.11b1
+black==21.12b0
 check-manifest==0.47
 doc8==0.10.1
 docker==5.0.3