Replace IncEx type copy with export from pydantic

fastapi/types.py

@@ -3,9 +3,9 @@ from enum import Enum
 from typing import Any, Callable, Optional, TypeVar, Union
 
 from pydantic import BaseModel
+from pydantic.main import IncEx as IncEx
 
 DecoratedCallable = TypeVar("DecoratedCallable", bound=Callable[..., Any])
 UnionType = getattr(types, "UnionType", Union)
 ModelNameMap = dict[Union[type[BaseModel], type[Enum]], str]
-IncEx = Union[set[int], set[str], dict[int, Any], dict[str, Any]]
 DependencyCacheKey = tuple[Optional[Callable[..., Any]], tuple[str, ...], str]