Remove unnecessary using directive from PersistentStateProviderServiceCollectionExtensions

Co-authored-by: javiercn <6995051+javiercn@users.noreply.github.com>

Author: Copilot

src/Components/Components/src/PersistentStateProviderServiceCollectionExtensions.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Microsoft.AspNetCore.Components;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;