[Fix] Type Hint in from_pretrained() to Ensure Correct Type Inference (#10714)

* Update pipeline_utils.py

Added Self in from_pretrained method so  inference will correctly recognize pipeline

* Use typing_extensions

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Co-authored-by: hlky <hlky@hlky.ac>

src/diffusers/pipelines/pipeline_utils.py

@@ -41,6 +41,7 @@ from huggingface_hub.utils import OfflineModeIsEnabled, validate_hf_hub_args
 from packaging import version
 from requests.exceptions import HTTPError
 from tqdm.auto import tqdm
+from typing_extensions import Self
 
 from .. import __version__
 from ..configuration_utils import ConfigMixin
@@ -513,7 +514,7 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
 
     @classmethod
     @validate_hf_hub_args
-    def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.PathLike]], **kwargs):
+    def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.PathLike]], **kwargs) -> Self:
         r"""
         Instantiate a PyTorch diffusion pipeline from pretrained pipeline weights.