refactor: 精简命名空间

Author: ArgoZhang

src/components/BootstrapBlazor.IP2Region/Extensions/ServiceCollectionExtensions.cs

@@ -3,7 +3,6 @@
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
 using BootstrapBlazor.Components;
-using Microsoft.Extensions.DependencyInjection.Extensions;
 
 namespace Microsoft.Extensions.DependencyInjection;