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

updates:
- [github.com/psf/black: 20.8b1 → 21.5b1](https://github.com/psf/black/compare/20.8b1...21.5b1)
- [github.com/PyCQA/flake8: 3.9.1 → 3.9.2](https://github.com/PyCQA/flake8/compare/3.9.1...3.9.2)
- [github.com/asottile/pyupgrade: v2.12.0 → v2.15.0](https://github.com/asottile/pyupgrade/compare/v2.12.0...v2.15.0)

watchdogpolska/feder,watchdogpolska/feder,watchdogpolska/feder,watchdogpolska/feder