Bump hypothesis from 5.49.0 to 6.2.0 (#758)

Author: dependabot[bot]

requirements/requirements_dev.txt

@@ -6,7 +6,7 @@ dlint==0.11.0
 flake8==3.8.4
 flake8-bandit==2.1.2
 flake8-bugbear==20.11.1
-hypothesis==5.49.0
+hypothesis==6.2.0
 placebo==0.9.0
 pre-commit==2.10.1
 pylint==2.6.0