Update flake8 requirement from >= 4.0.0 to >=5.0.4

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@4.0.0...5.0.4)

---
updated-dependencies:
- dependency-name: flake8
  dependency-version: 5.0.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -21,7 +21,7 @@ typing-extensions = ">= 4.7.1"
 pytest = ">= 7.2.1"
 pytest-cov = ">= 2.8.1"
 tox = ">= 3.9.0"
-flake8 = ">= 4.0.0"
+flake8 = ">=5.0.4"
 types-python-dateutil = ">= 2.8.19.14"
 mypy = ">= 1.5"