feat(nx): upgrade nx 20 and angular 19

apps/signal/54-pipe-observable-to-signal/src/app/app.component.ts

@@ -4,7 +4,6 @@ import { ProductRowComponent } from './product-row.component';
 import { products } from './product.model';
 
 @Component({
-  standalone: true,
   imports: [TableComponent, ProductRowComponent],
   selector: 'app-root',
   template: `

apps/signal/54-pipe-observable-to-signal/src/app/product-row.component.ts

@@ -10,7 +10,6 @@ import { CurrencyService } from './currency.service';
 import { Product } from './product.model';
 
 @Component({
-  standalone: true,
   selector: 'tr[product-row]',
   template: `
     <td>{{ productInfo.name }}</td>