Django-config-models

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* Adding python3.11 and 3.12 support.

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* Fixed issues with Django 4.2

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* Fixed ``ConfigurationModel.current``: it will make sure that it does not return None for current configuration.

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* Added support for Django42 in CI
* Switch from ``edx-sphinx-theme`` to ``sphinx-book-theme`` since the former is
deprecated

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* Added Support for Django40 in CI
* Dropped Support for Django22, 30, 31

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* Updated dependencies after removing unnecessary constraint on edx-django-utils, so the constraint will no longer be advertised.