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I tried to test django-river on new versions of Django(v4). There were some errors. Tried to fix it with this PR.
ugettext_lazy
was deprecated in v2.2 and no longer used in django v3+. Reference.django-mptt
package from 0.9.1 to 0.14. Referenceproviding_args
argument fromdjango.dispatch.dispatcher.Signal
objects. Reference.