Update dependency django-cleanup to v7

This MR contains the following updates:

Package	Type	Update	Change
django-cleanup	dependencies	major	^6.0.0 -> ^7.0.0

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Release Notes

un1t/django-cleanup

v7.0.0

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Added

• Run tests for django 4.1.
• Run tests on python 3.11 with django 4.1.
• Select mode, with the ability to only cleanup selected models using a select decorator. Resolves issue [#​75] for @​daviddavis.
• Documentation on the known limitations of referencing a file by multiple model instances. Resolves issue [#​98] for @​Grosskopf

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merged

mentioned in commit 8c97ed7a