remove unnecessary using statements

Oqtane.Client/UI/Interop.cs

@@ -1,10 +1,7 @@
 using Microsoft.AspNetCore.Components;
 using Microsoft.JSInterop;
-using System.Net;
-using System;
 using System.Threading.Tasks;
 using System.Text.Json;
-using System.Xml.Linq;
 using System.Collections.Generic;
 using System.Linq;