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Maintenance and bugfix release.
**💥 Breaking changes**
* Dropped support for Python 3.8 and 3.9.
* Dropped support for Django 3.2 and 4.1.
**Features**
* Support for Python 3.12 is confirmed.
**Bugfixes**
* Fixed a crash during validation when the polymorphic serializer allows ``None`` values
or is not required.