@dimstar, follow up on https://build.opensuse.org/request/show/998128#comment-1664132

This also drops out half of the test requirements of python-isort from Ring1:

• python-pylint
• python-libcst
• python-hypothesmith
• python-isort + python-pytest-isort
  • python-natsort
  • python-pip-api
  • python-pipreqs
  • python-docopt
  • python-yarg

And it even goes deeper, because poetry is then also not required anymore:

• python-poetry
  • python-CacheControl
  • python-cachy
  • python-cleo
  • python-clikit
  • python-shellingham