BunnyCDNStorage->HttpClient needs to implement IDisposable since it inherits from HttpMessageInvoker

[benrussill]

BunnyCDNStorage

• needs to implement IDisposable -> disposable pattern
• HttpClient inherits IDisposable from HttpMessageInvoker

HttpClient
public class HttpClient : System.Net.Http.HttpMessageInvoker

HttpMessageInvoker
public class HttpMessageInvoker : IDisposable