Update flake8 requirement from ~=7.0 to ~=7.1

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](PyCQA/flake8@7.0.0...7.1.0)

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

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

requirements-test.txt

@@ -2,7 +2,7 @@
 async-timeout
 asynctest~=0.13
 colorlog~=6.8
-flake8~=7.0
+flake8~=7.1
 flake8-docstrings~=1.7
 mypy~=1.10
 pylint~=3.2