[ISSUE #9988] Remove mismatched response header in getConsumerConnectionList (#9989)

Author: yx9o

proxy/src/main/java/org/apache/rocketmq/proxy/remoting/activity/ConsumerManagerActivity.java

@@ -94,7 +94,7 @@ protected RemotingCommand getConsumerListByGroup(ChannelHandlerContext ctx, Remo
 
     protected RemotingCommand getConsumerConnectionList(ChannelHandlerContext ctx, RemotingCommand request,
         ProxyContext context) throws Exception {
-        RemotingCommand response = RemotingCommand.createResponseCommand(GetConsumerConnectionListRequestHeader.class);
+        RemotingCommand response = RemotingCommand.createResponseCommand(null);
         GetConsumerConnectionListRequestHeader header = (GetConsumerConnectionListRequestHeader) request.decodeCommandCustomHeader(GetConsumerConnectionListRequestHeader.class);
         ConsumerGroupInfo consumerGroupInfo = messagingProcessor.getConsumerGroupInfo(context, header.getConsumerGroup());
         if (consumerGroupInfo != null) {