Bump black from 21.10b0 to 21.11b0 (#379)
Bump black from 21.10b0 to 21.11b0 (#379)

Bumps [black](https://github.com/psf/black) from 21.10b0 to 21.11b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
aio-libs/janus