Bump flake8 from 6.0.0 to 7.0.0

Bumps [flake8](https://github.com/pycqa/flake8) from 6.0.0 to 7.0.0.
- [Commits](PyCQA/flake8@6.0.0...7.0.0)

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

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

requirements.txt

@@ -1,4 +1,4 @@
 lxml==5.0.1
-flake8==6.0.0
+flake8==7.0.0
 pytz
 pytest==7.4.4