fix 重试获取任务

Src/Dlhis.ScheduledTask/TaskAssignment/Services/Implements/AssignmentService.cs

@@ -284,7 +284,10 @@ public class AssignmentService : IAssignmentService
                 .Where(where)
                 .ExecuteCommandAsync();
 
-            (taskIdVs.Count != effect).ThrowIfTrue("获取任务失败");
+            if (taskIdVs.Count != effect)
+            {
+                throw new VersionExceptions("version exceptions");
+            }
 
             return page.Data;
         }, 5);