Update flake8 requirement from ~=6.0 to ~=7.1

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@6.0.0...7.1.1)

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

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

Author: dependabot[bot]

Pipfile

@@ -20,7 +20,7 @@ pyyaml = "~=6.0"
 [dev-packages]
 # Codestyle checking modules:
 black = "~=25.1"
-flake8 = "~=6.0"
+flake8 = "~=7.1"
 pytest = "~=8.3"
 pytest-asyncio = "~=0.25"
 pytest-cov = "~=6.0"