Yii RBAC Database storage 2.1.0

Yii RBAC DB version 2.1.0 was released. In this version:

• Adapt to Yii DB 2
• Change PHP constraint in composer.json to 8.1 - 8.5
• Refactor AssignmentStorage::filterUserItemNames() method
• Bump yiisoft/rbac version to ^2.1
• Mark internal class ItemTreeTraversalFactory as final