chore(deps-dev): update flake8 requirement from ^6.1.0 to >=6.1,<8.0

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@6.1.0...7.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -22,7 +22,7 @@ toolz = "^0.12.0"
 wheel = ">=0.38.4,<0.42.0"
 pytest = "^7.4.3"
 pytest-cov = "^4.1.0"
-flake8 = "^6.1.0"
+flake8 = ">=6.1,<8.0"
 autopep8 = "^2.0.4"
 black = "^23.11.0"
 parameterized = "^0.9.0"