sorting usings

Author: jkotalik

test/Microsoft.AspNetCore.Http.Tests/ResponseCookiesTest.cs

@@ -1,12 +1,12 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Text;
 using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.Extensions.ObjectPool;
 using Microsoft.Net.Http.Headers;
 using Xunit;
-using System;
 
 namespace Microsoft.AspNetCore.Http.Tests
 {