Add missing import (#3917)

## What type of PR is this? (check all applicable)

- [ ] Refactor
- [ ] Feature
- [x] Bug Fix
- [ ] Optimization
- [ ] Documentation Update
- [ ] Community Node Submission

## Description

This import is missing and used later in the file.

invokeai/backend/model_management/lora.py

@@ -474,7 +474,7 @@ class ModelPatcher:
 
     @staticmethod
     def _lora_forward_hook(
-        applied_loras: List[Tuple[LoraModel, float]],
+        applied_loras: List[Tuple[LoRAModel, float]],
         layer_name: str,
     ):
 
@@ -519,7 +519,7 @@ class ModelPatcher:
     def apply_lora(
         cls,
         model: torch.nn.Module,
-        loras: List[Tuple[LoraModel, float]],
+        loras: List[Tuple[LoRAModel, float]],
         prefix: str,
     ):
         original_weights = dict()

invokeai/backend/model_management/models/lora.py

@@ -10,6 +10,7 @@ from .base import (
     SubModelType,
     classproperty,
     InvalidModelException,
+    ModelNotFoundException,
 )
 # TODO: naming
 from ..lora import LoRAModel as LoRAModelRaw