chore(deps): update dependency flake8 to v7

Author: renovate[bot]

pyproject.toml

@@ -40,7 +40,7 @@ codecov = "^2.1.11"
 pylint = "^2.8.2"
 isort = "^5.8.0"
 pytest = "^7.0.0"
-flake8 = "^4.0.0"
+flake8 = "^7.0.0"
 mypy = "^1.0"
 coverage = "^7.0.0"
 mkdocs = "^1.2.2"