Update dependency sphinxcontrib-django to v2.5

This MR contains the following updates:

Package	Update	Change
sphinxcontrib-django (changelog)	minor	==2.3 -> ==2.5

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Release Notes

edoburu/sphinxcontrib-django (sphinxcontrib-django)

v2.5

Compare Source

• Drop support for sphinx < 3.4.0
• [ #&#8203;45 <https://github.com/sphinx-doc/sphinxcontrib-django/issues/45>_ ] Fix rendering of inheritance diagrams
• Drop support for Python 3.7

v2.4

Compare Source

• [ #&#8203;39 <https://github.com/sphinx-doc/sphinxcontrib-django/issues/39>_ ] Fix table names of abstract models (@insspb <https://github.com/insspb>__)
• [ #&#8203;41 <https://github.com/sphinx-doc/sphinxcontrib-django/issues/41>_ ] Fix rendering of iterable choices (@insspb <https://github.com/insspb>__)

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