Class "Vin\ShopwareSdk\Data\Entity\Custom\CustomDefinition" not found

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After upgrading the package from 2.0 to dev-master (because I wanted the php 8.3 depreaction messages gone and there was no tag for this change yet), I noticed that CustomEntity is missing now and I'm getting "Class "Vin\ShopwareSdk\Data\Entity\Custom\CustomDefinition" not found" errors.

This is used in RepositoryFactory::getDefinition(), also I see tests which uses them, wonder how landed into master :)

Code is just RepositoryFactory::create('product_warehouse')