fix #5189: adding missing log if there is a close exception

Author: shawkins

httpclient-jdk/src/main/java/io/fabric8/kubernetes/client/jdkhttp/JdkWebSocketImpl.java

@@ -126,6 +126,7 @@ public synchronized boolean sendClose(int code, String reason) {
     CompletableFuture<java.net.http.WebSocket> cf = webSocket.sendClose(code, reason == null ? "Closing" : reason);
     cf = cf.whenComplete((w, t) -> {
       if (t != null) {
+        LOG.warn("Queued close did not succeed", t);
         abort();
       } else if (w != null) {
         webSocket.request(1); // there may not be demand, so request more