chore: update angular to v11

src/app/app.component.spec.ts

@@ -1,4 +1,4 @@
-import { TestBed, async } from '@angular/core/testing';
+import { TestBed, waitForAsync } from '@angular/core/testing';
 import { RouterTestingModule } from '@angular/router/testing';
 import { AppComponent } from './app.component';
 import { TranslateModule } from '@ngx-translate/core';
@@ -23,7 +23,7 @@ class MatSnackBarStub {
 }
 
 describe('AppComponent', () => {
-    beforeEach(async(() => {
+    beforeEach(waitForAsync(() => {
         TestBed.configureTestingModule({
             declarations: [AppComponent],
             providers: [
@@ -38,7 +38,7 @@ describe('AppComponent', () => {
         }).compileComponents();
     }));
 
-    it('should create the app', async(() => {
+    it('should create the app', waitForAsync(() => {
         const fixture = TestBed.createComponent(AppComponent);
         const app = fixture.debugElement.componentInstance;
         expect(app).toBeTruthy();