Upgrade to angular v11

overlord/src/app/client/client-detail/client-detail.component.spec.ts

@@ -1,4 +1,4 @@
-import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 import { MatDialogModule } from '@angular/material/dialog';
 import { ReactiveFormsModule } from '@angular/forms';
 import { RouterTestingModule } from '@angular/router/testing';
@@ -9,7 +9,7 @@ describe('ClientDetailComponent', () => {
   let component: ClientDetailComponent;
   let fixture: ComponentFixture<ClientDetailComponent>;
 
-  beforeEach(async(() => {
+  beforeEach(waitForAsync(() => {
     TestBed.configureTestingModule({
       imports: [MatDialogModule, ReactiveFormsModule, RouterTestingModule],
       declarations: [ClientDetailComponent],