chore: bump django-guardian from 1.4.9 to 2.3.0

[dependabot-preview]

Bumps django-guardian from 1.4.9 to 2.3.0.

Changelog

Sourced from django-guardian's changelog.

Release 2.3.0 (June 6, 2020)

• 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

Release 2.2.0 (January 3, 2020)

• 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.

Release 2.1.0 (September 9, 2019)

• 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

Release 2.0.0 (June 11, 2019)

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

Release 1.5.1 (May 2, 2019)

• Restore compatibility with Python 2.7

.. important:: The 1.5.x release line will be the last one that has support for Python 2.7.

Release 1.5.0 (Jan 31, 2019)

Commits

• e86e8f6 Bump version to 2.3.0
• 5ae59fb Update release date for 2.3.0
• a9dd4bf Update CHANGES
• 59e9560 Update CHANGES
• 736381b Update CHANGES
• c4704b0 Update CHANGES
• 17f6a1e Fix unittest mock imports that triggered the linter
• db937f3 Drop support for Django 2.1
• 96372b3 Run migrations check only if required version of django is installed
• d816cfe Fix handling of UUIDField for mysql, mariadb and sqlite
• Additional commits viewable in compare view

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[sakshi1499]

Closing this as #578 solves the same issue.

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.