Bump flake8 from 5.0.1 to 5.0.4

Bumps [flake8](https://github.com/pycqa/flake8) from 5.0.1 to 5.0.4.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@5.0.1...5.0.4)

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

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==0.19
-flake8==5.0.1
+flake8==5.0.4
 isort==5.10.1
 pycodestyle==2.9.0
 pyflakes==2.5.0