fix(mm): use correct import path for ConfigMixin, ModelMixin

invokeai/backend/model_manager/load/model_loaders/generic_diffusers.py

@@ -5,7 +5,8 @@ import sys
 from pathlib import Path
 from typing import Any, Dict, Optional
 
-from diffusers import ConfigMixin, ModelMixin
+from diffusers.configuration_utils import ConfigMixin
+from diffusers.models.modeling_utils import ModelMixin
 
 from invokeai.backend.model_manager import (
     AnyModel,