Update dependency flake8 to v7

Author: renovate[bot]

Pipfile

@@ -9,7 +9,7 @@ responses = "==0.20.0"
 mock = "==4.0.3"
 unittest2 = "==1.1.0"
 pre-commit = "==3.7.0"
-flake8 = "==4.0.1"
+flake8 = "==7.3.0"
 autopep8 = "==1.6.0"
 pipenv = "==2023.12.1"
 pep8-naming = "==0.12.1"