pip dependencies(deps-dev): update flake8 requirement (#1141)

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@6.0.0...7.0.0)

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

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pyproject.toml

@@ -91,7 +91,7 @@ development = [
     'basedmypy ~= 2.0, >= 2.2.1',
     'codecov ~= 2.1, >= 2.1.12',
     'coverage ~= 7.2, >= 7.2.4',
-    'flake8 ~= 6.0, >= 6.0.0',
+    'flake8 ~= 7.0',
     'html5lib ~= 1.1',
     'lxml ~= 5.0; sys.platform != "win32"',
     'pip-licenses ~= 4.3, >= 4.3.0',