Bump hypothesis from 5.37.3 to 5.37.4 in /docs (#691)

Bumps [hypothesis](https://github.com/HypothesisWorks/hypothesis) from 5.37.3 to 5.37.4.
- [Release notes](https://github.com/HypothesisWorks/hypothesis/releases)
- [Commits](HypothesisWorks/hypothesis@hypothesis-python-5.37.3...hypothesis-python-5.37.4)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

docs/requirements.txt

@@ -15,4 +15,4 @@ pygments==2.7.1
 typing-extensions==3.7.4.3
 mypy==0.790
 pytest==6.1.1
-hypothesis==5.37.3
+hypothesis==5.37.4