add IDisposable declaration to accompany existing Dispose() method

Oqtane.Client/UI/ContainerBuilder.razor

@@ -1,6 +1,7 @@
 @using System.ComponentModel
 @namespace Oqtane.UI
 @inject SiteState SiteState
+@implements IDisposable
 
 @if (ComponentType != null && _visible)
 {

Oqtane.Client/UI/SiteRouter.razor

@@ -13,6 +13,7 @@
 @inject ILogService LogService
 @inject IJSRuntime JSRuntime
 @implements IHandleAfterRender
+@implements IDisposable
 
 @if (!string.IsNullOrEmpty(_error))
 {