feat(nx): upgrade nx 20 and angular 19

apps/rxjs/11-high-order-operator-bug/src/app/app.component.ts

@@ -6,7 +6,6 @@ import { AppService } from './app.service';
 import { TopicType } from './localDB.service';
 
 @Component({
-  standalone: true,
   selector: 'button-delete-topic',
   imports: [AsyncPipe],
   template: `
@@ -36,7 +35,6 @@ export class ButtonDeleteComponent {
 }
 
 @Component({
-  standalone: true,
   imports: [AsyncPipe, NgFor, ButtonDeleteComponent],
   selector: 'app-root',
   template: `

apps/rxjs/14-race-condition/src/app/topic-dialog.component.ts

@@ -18,7 +18,6 @@ import { MAT_DIALOG_DATA, MatDialogModule } from '@angular/material/dialog';
     </div>
   `,
   imports: [MatDialogModule, MatButtonModule, NgFor],
-  standalone: true,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class TopicModalComponent {

apps/rxjs/14-race-condition/src/styles.scss

@@ -2,7 +2,8 @@
 
 @use '@angular/material' as mat;
 
-@include mat.core();
+@include mat.elevation-classes();
+@include mat.app-background();
 
 $theme-primary: mat.m2-define-palette(mat.$m2-indigo-palette);
 $theme-accent: mat.m2-define-palette(mat.$m2-pink-palette, A200, A100, A400);

apps/rxjs/38-catch-error/src/app/app.component.ts

@@ -6,7 +6,6 @@ import { FormsModule } from '@angular/forms';
 import { Subject, concatMap, map } from 'rxjs';
 
 @Component({
-  standalone: true,
   imports: [CommonModule, FormsModule],
   selector: 'app-root',
   template: `

apps/rxjs/49-hold-to-save-button/src/app/app.component.ts

@@ -1,7 +1,6 @@
 import { ChangeDetectionStrategy, Component } from '@angular/core';
 
 @Component({
-  standalone: true,
   imports: [],
   selector: 'app-root',
   template: `