Bump flake8 from 3.8.4 to 4.0.1 (#148)

Bumps [flake8](https://github.com/pycqa/flake8) from 3.8.4 to 4.0.1.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@3.8.4...4.0.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_dev.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 pre-commit==2.18.1
 black==22.3.0
-flake8==3.8.4
+flake8==4.0.1
 isort==5.10.1
 pylint>=2.6.0
 setuptools>=53.0.0