When using selectors.DefaultSelector() [ which is the DevPollSelector ]
cheroot can miss socket wakeups.

--- cheroot-11.0.0/cheroot/connections.py.orig
+++ cheroot-11.0.0/cheroot/connections.py
@@ -70,7 +70,7 @@
     """
 
     def __init__(self):
-        self._selector = selectors.DefaultSelector()
+        self._selector = selectors.PollSelector()
         self._lock = threading.Lock()
 
     def __len__(self):