Update dependency flake8 to v7

Author: renovate[bot]

requirements.txt

@@ -4,7 +4,7 @@ click==8.1.7 ; python_version >= "3.10" and python_version < "4.0"
 colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
 cssmin==0.2.0 ; python_version >= "3.10" and python_version < "4.0"
 faker==21.0.0 ; python_version >= "3.10" and python_version < "4.0"
-flake8==6.1.0 ; python_version >= "3.10" and python_version < "4.0"
+flake8==7.0.0 ; python_version >= "3.10" and python_version < "4.0"
 flask-assets==2.1.0 ; python_version >= "3.10" and python_version < "4.0"
 flask==3.0.0 ; python_version >= "3.10" and python_version < "4.0"
 gunicorn==21.2.0 ; python_version >= "3.10" and python_version < "4.0"