fix: make Color import backward-compatible for Pydantic v1 and v2

fastapi/encoders.py

@@ -26,6 +26,14 @@ from typing_extensions import Annotated, Doc
 
 from ._compat import PYDANTIC_V2, UndefinedType, Url, _model_dump
 
+try:
+    # Pydantic v2
+    from pydantic_extra_types.color import Color
+except ImportError:
+    # Fallback for Pydantic v1
+    from pydantic.color import Color
+
+
 
 # Taken from Pydantic v1 as is
 def isoformat(o: Union[datetime.date, datetime.time]) -> str: