Bump flake8 from 7.0.0 to 7.1.1 in /tests

Bumps [flake8](https://github.com/pycqa/flake8) from 7.0.0 to 7.1.1.
- [Commits](PyCQA/flake8@7.0.0...7.1.1)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tests/requirements-test.txt

@@ -1,6 +1,6 @@
 # micro-language and markers are described here: https://www.python.org/dev/peps/pep-0496/
 pytest==8.1.1
-flake8==7.0.0
+flake8==7.1.1
 sphinx<7.2 ; python_version < '3.9'
 sphinx==7.3.7; python_version >= '3.9'
 mcpl==1.6.2