Potential fix for pull request finding 'Unused import'

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: dkropachev

cassandra/io/twistedreactor.py

@@ -17,7 +17,6 @@
 """
 import atexit
 import logging
-import ssl
 import time
 from functools import partial
 from threading import Thread, Lock