Fix ClientWebSocketContainerTests for current API

**Cherry-pick to `5.5.x`**

Author: ColoredCarrot

spring-integration-websocket/src/test/java/org/springframework/integration/websocket/ClientWebSocketContainerTests.java

@@ -150,7 +150,7 @@ public void testWebSocketContainerOverflowStrategyPropagation() throws Exception
 		webSocketClient.setUserProperties(userProperties);
 
 		ClientWebSocketContainer container =
-				new ClientWebSocketContainer(webSocketClient, new URI(server.getWsBaseUrl() + "/ws/websocket"));
+				new ClientWebSocketContainer(webSocketClient, server.getWsBaseUrl() + "/ws/websocket");
 
 		container.setSendTimeLimit(10_000);
 		container.setSendBufferSizeLimit(12345);