Ignore lingering pycares shutdown thread (home-assistant#146733)

Author: cdce8p

tests/conftest.py

@@ -382,8 +382,10 @@ def verify_cleanup(
     # Verify no threads where left behind.
     threads = frozenset(threading.enumerate()) - threads_before
     for thread in threads:
-        assert isinstance(thread, threading._DummyThread) or thread.name.startswith(
-            "waitpid-"
+        assert (
+            isinstance(thread, threading._DummyThread)
+            or thread.name.startswith("waitpid-")
+            or "_run_safe_shutdown_loop" in thread.name
         )
 
     try: