[PyUP] Update django-modelcluster to 5.3

[pyup-bot]

This PR updates django-modelcluster from 3.1 to 5.3.

Changelog

5.2

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* Implement `copy_cluster` method on ClusterableModel (Karl Hobley)
* Add `formset_name` option on ClusterableModel formsets to allow the formset name to differ from the relation name (Matt Westcott)
* Fix: Fix tests for Django 3.2 (Alex Tomkins, Matt Westcott, María Fernanda Magallanes)
* Fix: Ensure ptr_id fields are correctly populated when deserialising models with multi-level inheritance (Alex Tomkins)

5.1

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* Allow child form class to be overridden in the `formsets` Meta property of ClusterForm (Helder Correia)
* Add prefetch_related support to ParentalManyToManyField (Andy Chosak)
* Implement `copy_child_relation` and `copy_all_child_relations` methods on ClusterableModel (Karl Hobley)
* Fix: Fix behavior of ParentalKeys and prefetch_related() supplied with a lookup queryset (Juha Yrjölä)

5.0.2

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* Fix: Fix compatibility with django-taggit 1.3.0 (Martin Sandström)

5.0.1

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* Fix: ClusterForm without an explicit `formsets` kwarg now allows formsets to be omitted from form submissions, to fix regression with nested relations
* Fix: ParentalManyToManyField data is now loaded correctly by `manage.py loaddata` (Andy Babic)

5.0

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* Removed Python 2 and 3.4 support
* Removed Django 1.10 and 1.11 support
* Added django-taggit 1.x compatibility (Gassan Gousseinov, Matt Westcott)

4.4.1

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* Fix: ClusterForm without an explicit `formsets` kwarg now allows formsets to be omitted from form submissions, to fix regression with nested relations

4.4

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* Django 2.2 compatibility
* Support nested child relationships in ClusterForm (Sam Costigan)

4.3

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* Added support for filter lookup expressions such as `__lt`

4.2

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* Django 2.1 compatibility
* Python 3.7 compatibility
* Implemented prefetch_related on FakeQuerySet (Haydn Greatnews)
* Fix: Saving a ClusterableModel with a primary key of 0 no longer throws an IntegrityError (A Lee)
* Fix: Serialization now respects `serialize=False` on ParentalManyToManyFields (Tadas Dailyda)

4.1

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* `on_delete` on ParentalKey now defaults to CASCADE if not specified

4.0

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* Django 2.0 compatibility
* Removed Django 1.8 and 1.9 support
* Child formsets now validate uniqueness constraints
* Fix: Many-to-many relations inside inline formsets are now saved correctly

Links

• PyPI: https://pypi.org/project/django-modelcluster
• Changelog: https://pyup.io/changelogs/django-modelcluster/
• Repo: https://github.com/wagtail/django-modelcluster