chore: add ast-grep rule to convert Optional[T] to T | None (#25560)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/rag/extractor/blob/blob.py

@@ -12,7 +12,7 @@ import mimetypes
 from collections.abc import Generator, Mapping
 from io import BufferedReader, BytesIO
 from pathlib import Path, PurePath
-from typing import Any, Optional, Union
+from typing import Any, Union
 
 from pydantic import BaseModel, ConfigDict, model_validator
 
@@ -30,17 +30,17 @@ class Blob(BaseModel):
     """
 
     data: Union[bytes, str, None] = None  # Raw data
-    mimetype: Optional[str] = None  # Not to be confused with a file extension
+    mimetype: str | None = None  # Not to be confused with a file extension
     encoding: str = "utf-8"  # Use utf-8 as default encoding, if decoding to string
     # Location where the original content was found
     # Represent location on the local file system
     # Useful for situations where downstream code assumes it must work with file paths
     # rather than in-memory content.
-    path: Optional[PathLike] = None
+    path: PathLike | None = None
     model_config = ConfigDict(arbitrary_types_allowed=True, frozen=True)
 
     @property
-    def source(self) -> Optional[str]:
+    def source(self) -> str | None:
         """The source location of the blob as string if known otherwise none."""
         return str(self.path) if self.path else None
 
@@ -91,7 +91,7 @@ class Blob(BaseModel):
         path: PathLike,
         *,
         encoding: str = "utf-8",
-        mime_type: Optional[str] = None,
+        mime_type: str | None = None,
         guess_type: bool = True,
     ) -> Blob:
         """Load the blob from a path like object.
@@ -120,8 +120,8 @@ class Blob(BaseModel):
         data: Union[str, bytes],
         *,
         encoding: str = "utf-8",
-        mime_type: Optional[str] = None,
-        path: Optional[str] = None,
+        mime_type: str | None = None,
+        path: str | None = None,
     ) -> Blob:
         """Initialize the blob from in-memory data.