remove unused imports in sync client

Author: AlePouroullis

src/humanloop/sync/sync_client.py

@@ -1,14 +1,8 @@
-import multiprocessing
-import os
 import logging
 from pathlib import Path
-import concurrent.futures
-from typing import List, TYPE_CHECKING, Union, cast, Optional, Dict
+from typing import List, TYPE_CHECKING, Optional
 from functools import lru_cache
 
-from humanloop.types import FileType, PromptResponse, AgentResponse, ToolResponse, DatasetResponse, EvaluatorResponse, FlowResponse
-from humanloop.core.api_error import ApiError
-
 if TYPE_CHECKING:
     from humanloop.base_client import BaseHumanloop