Merge branch 'mk/fix-v2-examples-serialization' of https://github.com/microsoft/OpenAPI.NET into mk/fix-v2-examples-serialization

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/V2/OpenApiResponseDeserializer.cs

@@ -1,6 +1,7 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using System;
 using System.Collections.Generic;
 using Json.Schema;
 using Microsoft.OpenApi.Extensions;