Bump flake8 from 5.0.3 to 5.0.4 (#3770)

Bumps [flake8](https://github.com/pycqa/flake8) from 5.0.3 to 5.0.4.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](https://github.com/pycqa/flake8/compare/5.0.3...5.0.4)

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

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

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

requirements_tests.txt

@@ -2,7 +2,7 @@ black==22.6.0
 codecov==2.1.12
 coverage==6.4.2
 flake8-docstrings==1.6.0
-flake8==5.0.3
+flake8==5.0.4
 pre-commit==2.20.0
 pydocstyle==6.1.1
 pylint==2.14.5