Fix: use cached port for logging (#1045)

Especially in the error handler, it's worth using the cached port as the
underlying socket might already have been close which can lead to errors masking
the actual exception that should be surfaced to the user instead.

Author: robsdedude

neo4j/io/__init__.py

@@ -588,7 +588,7 @@ def _set_defunct(self, message, error=None, silent=False):
         direct_driver = isinstance(self.pool, BoltPool)
 
         if error:
-            log.debug("[#%04X]  %r", self.socket.getsockname()[1], error)
+            log.debug("[#%04X]  %r", self.local_port, error)
         log.error(message)
         # We were attempting to receive data but the connection
         # has unexpectedly terminated. So, we need to close the