Update django-treebeard to 4.7

[pyup-bot]

This PR updates django-treebeard from 4.5.1 to 4.7.

Changelog

4.7

----------------------------

* Drop support for Django 4.0.
* Add support for Django 4.2.

4.6.1

----------------------------

* Fix unescaped string representation of `AL_Node` models in the Django admin. 
Thanks to goodguyandy for reporting the issue.
* Optimise `MP_Node.get_descendants` to avoid database queries when called on a leaf node.

4.6

----------------------------

* Drop support for Django 3.1 and lower.
* Add support for Django 4.0 and 4.1.
* Drop support for Python 3.7 and lower.
* Add support for Python 3.10 and Python 3.11.
* Change the return value of `delete()` for all node classes to be consistent with Django,
and return a tuple of the number of objects deleted and a dictionary with the number of 
deletions per object type.
* Change the `delete()` methods for all node classes to accept arbitrary positional and 
keyword arguments which are passed to the parent method.
* Set `alters_data` and `queryset_only` attributes on the `delete()` methods for all node classes
to prevent them being used in an unwanted context (e.g., in Django templates).
* Drop dependency on jQuery UI in the admin.

Links

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