Bump flake8 from 4.0.1 to 6.1.0

Bumps [flake8](https://github.com/pycqa/flake8) from 4.0.1 to 6.1.0.
- [Commits](PyCQA/flake8@4.0.1...6.1.0)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -2,6 +2,6 @@ pytest==6.2.5
 pytest-vcr==1.0.2
 pytest-cov==3.0.0
 black==22.3.0
-flake8==4.0.1
+flake8==6.1.0
 isort[pipfile]==5.10.1
 mypy==0.790