Bump flake8 from 4.0.1 to 5.0.1

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 5.0.1.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@4.0.1...5.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tests/requirements.txt

@@ -2,7 +2,7 @@ aiohttp==3.8.1
 black==22.6.0
 coverage==6.4.2
 docutils==0.18.1
-flake8==4.0.1
+flake8==5.0.1
 isort==5.10.1
 pycodestyle==2.8.0
 pyflakes==2.4.0