Replace IOError with OSError (#16715)
diff --git a/Lib/test/test_timeout.py b/Lib/test/test_timeout.py
index c3c4acf..d28d62b 100644
--- a/Lib/test/test_timeout.py
+++ b/Lib/test/test_timeout.py
@@ -194,7 +194,7 @@
             sock.connect((whitehole))
         except socket.timeout:
             pass
-        except IOError as err:
+        except OSError as err:
             if err.errno == errno.ECONNREFUSED:
                 skip = False
         finally: