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

updates:
- [github.com/PyCQA/flake8: 3.9.0 → 3.9.1](https://github.com/PyCQA/flake8/compare/3.9.0...3.9.1)

cphyc/matplotlib-label-lines