Update dependency django-test-plus to v2

This MR contains the following updates:

Package	Type	Update	Change
django-test-plus	dev	major	^1.4.0 -> ^2.0.0
django-test-plus		major	==1.4.0 -> ==2.2.4

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Release Notes

revsys/django-test-plus (django-test-plus)

v2.2.4

• Fix bug with APITest case

v2.2.3

Compare Source

• Fix bug where email addresses were not created by make_user()

v2.2.2

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• Fix issue with User creation helper when User model doesn't have a username field
  • Improve assertNumQueriesLessThan
  • Add assertInContext

v2.2.1

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• Add Django 4.2 support

v2.2.0

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• Add support for Django 3.2.

v2.1.0

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v2.0.1

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• Make assertLoginRequired work for pytest tp fixture.

v2.0.0

Compare Source

• Drops Python 2.7, 3.4, and pypy and Django 1.11 support.
  • Add Django 3.1 support.

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