Update flake8 requirement from ^5.0.4 to >=5.0.4,<8.0.0 (#762)

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@5.0.4...7.3.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-version: 7.3.0
  dependency-type: direct:development
...

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pyproject.toml

@@ -53,7 +53,7 @@ pytest = "^8.0.2"
 ipdb = "^0.13.9"
 black = ">=24.2,<26.0"
 isort = ">=5.9.3,<8.0.0"
-flake8 = "^5.0.4"
+flake8 = ">=5.0.4,<8.0.0"
 bandit = "^1.7.4"
 coverage = "^7.1"
 pytest-cov = ">=5,<8"