Fix type annotation (#5146)

* Fix type annotation on Scheduler.from_pretrained

* Fix type annotation on PIL.Image

tests/others/test_image_processor.py

@@ -16,7 +16,7 @@
 import unittest
 
 import numpy as np
-import PIL
+import PIL.Image
 import torch
 
 from diffusers.image_processor import VaeImageProcessor

tests/pipelines/test_pipelines.py

@@ -26,7 +26,7 @@ import unittest
 import unittest.mock as mock
 
 import numpy as np
-import PIL
+import PIL.Image
 import requests_mock
 import safetensors.torch
 import torch

tests/pipelines/test_pipelines_common.py

@@ -11,7 +11,7 @@ import uuid
 from typing import Callable, Union
 
 import numpy as np
-import PIL
+import PIL.Image
 import torch
 from huggingface_hub import delete_repo
 from transformers import CLIPTextConfig, CLIPTextModel, CLIPTokenizer