Bump hypothesis from 6.21.5 to 6.21.6 in /docs (#1074)

Bumps [hypothesis](https://github.com/HypothesisWorks/hypothesis) from 6.21.5 to 6.21.6.
- [Release notes](https://github.com/HypothesisWorks/hypothesis/releases)
- [Commits](HypothesisWorks/hypothesis@hypothesis-python-6.21.5...hypothesis-python-6.21.6)

---
updated-dependencies:
- dependency-name: hypothesis
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -15,7 +15,7 @@ pygments==2.10.0
 typing-extensions==3.10.0.2
 mypy==0.910
 pytest==6.2.5
-hypothesis==6.21.5
+hypothesis==6.21.6
 
 # TODO: Remove this lock when we found and fix the route case.
 # See: https://github.com/typlog/sphinx-typlog-theme/issues/22