feat: enable multiple http2 connections (#1304)

Author: IvanJosipovic

src/KubernetesClient/Kubernetes.ConfigInit.cs

@@ -130,6 +130,7 @@ private void CreateHttpClient(DelegatingHandler[] handlers, KubernetesClientConf
                 KeepAlivePingPolicy = HttpKeepAlivePingPolicy.WithActiveRequests,
                 KeepAlivePingDelay = TimeSpan.FromMinutes(3),
                 KeepAlivePingTimeout = TimeSpan.FromSeconds(30),
+                EnableMultipleHttp2Connections = true,
             };
 
             HttpClientHandler.SslOptions.ClientCertificates = new X509Certificate2Collection();