Set the serialized_aliases Argument of setup_databases.

[xmatos-so]

The serialized_aliases argument of the setup_databases function determines what subset of aliases test databases should have their state serialized to allow usage of the serialized_rollback feature. If it's not provided, it defaults to aliases.

Django 5 removed the SERIALIZE test setting, as it can be inferred from the databases with the serialized_rollback option enabled. Django's default test runner, DiscoverRunner, uses logic similar to this to build the serialized_aliases set and pass it to setup_databases, as implemented in django.test.runner.DiscoverRunner.run_tests.