replace CloneTLSConfig() with (*tls.Config).Clone()

Kubernetes-commit: 6c6dbec1e2364b994bdae42828e094b9b540f9b3

pkg/util/proxy/dial.go

@@ -69,7 +69,7 @@ func DialURL(url *url.URL, transport http.RoundTripper) (net.Conn, error) {
 					inferredHost = host
 				}
 				// Make a copy to avoid polluting the provided config
-				tlsConfigCopy := utilnet.CloneTLSConfig(tlsConfig)
+				tlsConfigCopy := tlsConfig.Clone()
 				tlsConfigCopy.ServerName = inferredHost
 				tlsConfig = tlsConfigCopy
 			}