Update dependency django-guardian to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-guardian	==1.5.1 -> ==2.4.0

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Release Notes

django-guardian/django-guardian (django-guardian)

v2.4.0

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• Add support for Python 3.9
• Add support for Django 3.1, Django 3.2
• Add parameter any_perm to PermissionRequiredMixin
• Switch from Travis CI to GitHub Actions_

v2.3.0

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• Drop support for Django 2.1
• Fix compatibility with UUIDField primary keys
• Fix formatting for pyupgrade
• Fix error with get_objects_for_user on PostgreSQL
• Modify 'assign_perm' shortcut to treat lists as a queryset
• Updated links to Django documentation and django-authority repository
• Removed reference to "easy_install" in the documentation
• Run migrations check only if required version of django is installed

v2.2.0

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• Add support for Django 3.0 and Python 3.8.
• Add support for custom generic object permission models.
• Don't initialise anonymous user on DB where it's not migrated.
• Allow object permissions with dots.
• Several performance improvements
  • Improve performance of get_objects_for_user
  • Update get_users_with_perms to avoid a large join

.. important::
The 2.2.x release line will be the last one that has support for Django 2.1.

v2.1.0

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• Upgrade to use django.urls.path in routing
  • Add admin support for user primary key as UUID
• Auto pre-fetching permission via GUARDIAN_AUTO_PREFETCH
• Add tests for missing migrations

v2.0.0

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• Drop support for Python 2.7 & 3.4 and Django 1.11 & 2.0

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