Update dependency django-model-utils to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-model-utils	^4 -> ^5

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Release Notes

jazzband/django-model-utils (django-model-utils)

v5.0.0

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• Add formal support for Django 5.1
• Remove MonitorField deprecation warning. None - instead of
  django.utils.timezone.now will be used when nullable and no default provided (GH-#​599)
• Add deprecation warning for MonitorField. The default value will be None
  instead of django.utils.timezone.now - when nullable and without a default.
• Add Brazilian Portuguese translation (GH-#​578)
• Don't use post_init signal for initialize tracker
• Make contribute_to_class() in StatusField, MonitorField and SplitField
  forward additional arguments to Django
• SplitField no longer accepts no_excerpt_field as a keyword argument
• Make soft argument to SoftDeletableModel.delete() keyword-only
• JoinManager and JoinManagerMixin have been deprecated;
  please use JoinQueryset.as_manager() instead
• Change SoftDeletableQuerySetMixin.delete to replicate Django's API.

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