removed model_config since not needed anymore

Author: Gabefire

libs/labelbox/src/labelbox/schema/slice.py

@@ -1,4 +1,3 @@
-from pydantic import ConfigDict
 from pydantic.dataclasses import dataclass
 from typing import Optional, Tuple, Union
 import warnings
@@ -37,7 +36,6 @@ class Slice(DbObject):
     class DataRowIdAndGlobalKey:
         id: UniqueId
         global_key: Optional[GlobalKey]
-        model_config = ConfigDict(arbitrary_types_allowed=True)
 
         def __init__(self, id: str, global_key: Optional[str]):
             self.id = UniqueId(id)