Bump hypothesis from 6.21.5 to 6.21.6 (#1075)

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:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]