Replace bytes | str | Path with StrOrBytesPath

Co-authored-by: Ondrej Baranovič <[email protected]>

src/PIL/_util.py

@@ -11,7 +11,7 @@ def is_path(f: Any) -> TypeGuard[StrOrBytesPath]:
     return isinstance(f, (bytes, str, os.PathLike))
 
 
-def is_directory(f: Any) -> TypeGuard[bytes | str | Path]:
+def is_directory(f: Any) -> TypeGuard[StrOrBytesPath]:
     """Checks if an object is a string, and that it points to a directory."""
     return is_path(f) and os.path.isdir(f)