fix: 更新命名空间紧急修复编译失败错误

src/admin/Bootstrap.Admin/Startup.cs

@@ -1,5 +1,4 @@
-using Bootstrap.Admin.Tasks;
-using Bootstrap.DataAccess;
+using Bootstrap.DataAccess;
 using Longbow.Web.SignalR;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Builder;
@@ -8,6 +7,7 @@ using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.AspNetCore.Mvc.Versioning;
+using Microsoft.AspNetCore.SignalR;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;

src/admin/Bootstrap.Admin/Tasks/TaskLogHub.cs

@@ -1,6 +1,6 @@
 using Longbow.Web.SignalR;
 
-namespace Bootstrap.Admin.Tasks
+namespace Microsoft.AspNetCore.SignalR
 {
     /// <summary>
     /// 后台任务消息Hub