8327989: java/net/httpclient/ManyRequest.java should not use "localhost" in URIs

Reviewed-by: jpai, djelinski, gli

test/jdk/java/net/httpclient/ManyRequests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -187,7 +187,7 @@ public class ManyRequests {
 
         URI baseURI = URIBuilder.newBuilder()
                 .scheme("https")
-                .host(InetAddress.getLoopbackAddress().getHostName())
+                .loopback()
                 .port(port)
                 .path("/foo/x").build();
         server.createContext("/foo", new TestEchoHandler());