remove unused import

Signed-off-by: sampan <sampan@anyscale.com>

Author: sampan

python/ray/tests/unit/test_auth_token_loader.py

@@ -4,7 +4,6 @@
 import tempfile
 import threading
 from pathlib import Path
-from unittest import mock
 
 import pytest
 
@@ -317,4 +316,3 @@ def test_token_loader_with_ray_init(self, default_token_path):
         assert default_token_path.exists()
         saved_token = default_token_path.read_text().strip()
         assert saved_token == token
-