Fix unused import errors

Summary: See https://github.com/facebook/pyre-check/actions/runs/6114821847/job/16597179238

Reviewed By: grievejia

Differential Revision: D49093095

fbshipit-source-id: ad85403a17814c11853ac83f49dbdc3409308b00

Author: arthaud

client/commands/subscription.py

@@ -17,9 +17,7 @@
 
 import dataclasses
 import json
-from typing import List, Optional, Union
-
-from .. import error
+from typing import Optional, Union
 
 from . import incremental