test_selectors: remove unused imports
diff --git a/Lib/test/test_selectors.py b/Lib/test/test_selectors.py
index f7e84b7..5e55eee 100644
--- a/Lib/test/test_selectors.py
+++ b/Lib/test/test_selectors.py
@@ -5,7 +5,7 @@
 import signal
 import socket
 from test import support
-from time import sleep, perf_counter, get_clock_info
+from time import sleep
 import unittest
 import unittest.mock
 try: