build(deps): update dependency django-treebeard to v4.5.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-treebeard	==4.3.1 -> ==4.5.1

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Release Notes

django-treebeard/django-treebeard

v4.5.1

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• Removed unnecessary default in MP's depth field.

v4.5

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• Removed unnecessary default in MP's depth field.

v4.4

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• Implement a non-destructive path-fixing algorithm for MP_Node.fix_tree.
• Ensure post_save is triggered after the parent node is updated in MP_AddChildHandler.
• Fix static URL generation to use static template tag instead of constructing the URL manually.
• Declare support for Django 2.2, 3.0 and 3.1.
• Drop support for Django 2.1 and lower.
• Drop support for Python 2.7 and Python 3.5.
• Increase performance for MoveNodeForm when using large trees.

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Configuration

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