Bump flake8 from 4.0.1 to 5.0.3

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 5.0.3.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](https://github.com/pycqa/flake8/compare/4.0.1...5.0.3)

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

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

setup.py

@@ -43,7 +43,7 @@ setup(
         'dev': [
             'nose==1.3.7',
             'coveralls==3.3.1',
-            'flake8==4.0.1'
+            'flake8==5.0.3'
         ]
     },
     zip_safe=False