fix(deps-dev): update flake8 requirement from 5.0.4 to 6.0.0

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Release notes](https://github.com/pycqa/flake8/releases)
- [Commits](PyCQA/flake8@5.0.4...6.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:development
...

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

Author: dependabot[bot]

Pipfile

@@ -12,7 +12,7 @@ jsonschema2md = "0.4.0"
 PyYAML = "5.4.1"
 pre-commit = "2.20.0"
 # Please keep the following in-sync /w .pre-commit-config.yaml
-flake8 = "5.0.4"
+flake8 = "6.0.0"
 isort = "5.10.1"
 pylint = "2.15.8"
 black = "22.12.0"