Bump flake8 from 6.1.0 to 7.0.0 (#666)

Bumps [flake8](https://github.com/pycqa/flake8) from 6.1.0 to 7.0.0.
- [Commits](PyCQA/flake8@6.1.0...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,7 +1,7 @@
 pip==23.3.2
 Sphinx==7.2.6
 lxml==5.0.0
-flake8==6.1.0
+flake8==7.0.0
 Jinja2==3.1.2
 pytz==2023.3.post1
 python-dateutil==2.8.2