Bump flake8 to 4.0.0, pydocstyle to 2.8.0, pyflakes to 2.4.0 (#1149)
Bump flake8 to 4.0.0, pydocstyle to 2.8.0, pyflakes to 2.4.0 (#1149)

* Bump flake8 from 3.9.2 to 4.0.0

Bumps [flake8](https://github.com/pycqa/flake8) from 3.9.2 to 4.0.0.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](https://github.com/pycqa/flake8/compare/3.9.2...4.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update ci.txt

* Update ci.txt

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Co-authored-by: Kamil Breguła <778b89a3582a5bad10b146dd5e664ccdc2685de8@users.noreply.github.com>
KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend,KlubJagiellonski/pola-backend