Bump flake8 from 6.0.0 to 6.1.0

Bumps [flake8](https://github.com/pycqa/flake8) from 6.0.0 to 6.1.0.
- [Commits](PyCQA/flake8@6.0.0...6.1.0)

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

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

requirements_dev.txt

@@ -1,3 +1,3 @@
-flake8==6.0.0
+flake8==6.1.0
 Flask==2.3.3
 pytest==7.4.0