Update python-django-polymorphic to version 3.1 / rev 4 via SR 1223824
    
    https://build.opensuse.org/request/show/1223824
    by user StevenK + anag+factory
    - Update URL.
    - Switch to pyproject and autosetup macros.
    - No more greedy globs in %files.
    - Add patch support-new-django.patch:
      * Support new Django assertion method name.
    - Add patch skip-two-lookup-tests.patch:
      * Skip two tests that are currently broken