Bump flake8-isort from 5.0.3 to 6.0.0

Bumps [flake8-isort](https://github.com/gforcada/flake8-isort) from 5.0.3 to 6.0.0.
- [Release notes](https://github.com/gforcada/flake8-isort/releases)
- [Changelog](https://github.com/gforcada/flake8-isort/blob/master/CHANGES.rst)
- [Commits](gforcada/flake8-isort@5.0.3...6.0.0)

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

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

setup.py

@@ -91,7 +91,7 @@
             'flake8-black==0.3.5',
             'flake8-bugbear==22.12.6',
             'flake8-docstrings==1.6.0',
-            'flake8-isort==5.0.3',
+            'flake8-isort==6.0.0',
             'flake8-quotes==3.3.2',
             'pep8-naming==0.13.2',
         ],