chore: Remove unused imports from sync_client.py

Author: anubhav756

packages/toolbox-core/src/toolbox_core/sync_client.py

@@ -14,9 +14,7 @@
 
 import asyncio
 from threading import Thread
-from typing import Any, Awaitable, Callable, Mapping, Optional, TypeVar, Union
-
-from aiohttp import ClientSession
+from typing import Any, Callable, Mapping, Optional, TypeVar, Union
 
 from .client import ToolboxClient
 from .sync_tool import ToolboxSyncTool