feat(nx): upgrade nx 20 and angular 19

apps/testing/17-router/src/app/app.component.ts

@@ -2,7 +2,6 @@ import { Component } from '@angular/core';
 import { RouterLink, RouterOutlet } from '@angular/router';
 
 @Component({
-  standalone: true,
   imports: [RouterOutlet, RouterLink],
   selector: 'app-root',
   styles: [

apps/testing/17-router/src/app/search.component.ts

@@ -5,7 +5,6 @@ import { RouterLink } from '@angular/router';
 import { availableBooks } from './book.model';
 
 @Component({
-  standalone: true,
   imports: [ReactiveFormsModule, RouterLink, NgFor, NgIf],
   styles: [
     `

apps/testing/17-router/src/app/shelf.component.ts

@@ -6,7 +6,6 @@ import { availableBooks } from './book.model';
 
 @Component({
   selector: 'app-shelf',
-  standalone: true,
   imports: [AsyncPipe, JsonPipe, NgFor],
   template: `
     <ul>