[pre-commit.ci] pre-commit autoupdate
[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.8b0 → 21.9b0](https://github.com/psf/black/compare/21.8b0...21.9b0)
- [github.com/pycqa/flake8: 3.9.2 → 4.0.1](https://github.com/pycqa/flake8/compare/3.9.2...4.0.1)
- [github.com/asottile/setup-cfg-fmt: v1.17.0 → v1.18.0](https://github.com/asottile/setup-cfg-fmt/compare/v1.17.0...v1.18.0)

maartenq/clustercron