Update dependency django-reversion to v4

This MR contains the following updates:

Package	Type	Update	Change
django-reversion	dependencies	major	^3.0.7 -> ^4.0.0

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Release Notes

etianen/django-reversion

v4.0.0

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• Breaking: The create_revision view decorator and RevisionMiddleware no longer roll back the revision and database transaction on response status code >= 400. It's the responsibility of the view to use transaction.atomic() to roll back any invalid data. This can be enabled globally by setting ATOMIC_REQUESTS=True. (@​etianen)

  https://docs.djangoproject.com/en/3.1/ref/settings/#std:setting-DATABASE-ATOMIC_REQUESTS

• Fixing gettext plural forms with Django (@​martinsvoboda).

• Deprecation removals (@​lociii, @​Peter-van-Tol).

• CI testing improvements (@​etianen, @​michael-k).

• Documentation fixes (@​erikrw, @​jedie, @​michael-k).

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