revert export changes

Author: Gabefire

libs/labelbox/src/labelbox/schema/export_task.py

@@ -2,7 +2,7 @@
 import os
 import tempfile
 from abc import ABC, abstractmethod
-from pydantic.dataclasses import dataclass
+from dataclasses import dataclass
 from enum import Enum
 from functools import lru_cache
 from typing import (