Update flake8 requirement from ~=6.1.0 to >=6.1,<7.2

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@6.1.0...7.1.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

setup.cfg

@@ -59,7 +59,7 @@ python_requires = >= 3.9
 [options.extras_require]
 dev =
     black~=23.7.0
-    flake8~=6.1.0
+    flake8>=6.1,<7.2
     flake8-bugbear~=23.7.10
     flake8-docstrings~=1.7.0
     pep8-naming~=0.13.3