[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci[bot]]

updates:

• github.com/psf/black: stable → 21.10b0
• https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8
• github.com/PyCQA/flake8: 3.7.8 → 4.0.1
• https://github.com/pre-commit/mirrors-isort → https://github.com/PyCQA/isort
• github.com/PyCQA/isort: v4.3.21 → 5.10.1
• github.com/pre-commit/pre-commit-hooks: v2.3.0 → v4.0.1