Update customResource example + bump nuget packages versions (#720)

Update customResource example nuget packages + update example

Update httpClientFactory example nuget packages

Update nuget packages

Change DateTime to DateTimeOffset

Update tests nuget packages

Make KubernetesClient project reference instead of Nuget package reference

Co-authored-by: Boshi Lian <farmer1992@gmail.com>

Co-authored-by: Boshi Lian <farmer1992@gmail.com>

examples/customResource/cResource.cs

@@ -1,6 +1,4 @@
 using k8s.Models;
-using System.Collections.Generic;
-using k8s;
 using Newtonsoft.Json;
 
 namespace customResource