build(deps): bump flake8 from 3.9.2 to 6.0.0

Bumps [flake8](https://github.com/pycqa/flake8) from 3.9.2 to 6.0.0.
- [Commits](https://github.com/pycqa/flake8/compare/3.9.2...6.0.0)

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

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

requirements.txt

@@ -1,3 +1,3 @@
 black==22.3.0
-flake8==3.9.2
+flake8==6.0.0
 requests==2.31.0