refactor: replace usage of deprecated mapTo with map

packages/angular_devkit/build_angular/src/builders/ng-packagr/index.ts

@@ -9,7 +9,7 @@
 import { BuilderContext, BuilderOutput, createBuilder } from '@angular-devkit/architect';
 import type { NgPackagrOptions } from 'ng-packagr';
 import { join, resolve } from 'path';
-import { Observable, catchError, from, mapTo, of, switchMap } from 'rxjs';
+import { Observable, catchError, from, map, of, switchMap } from 'rxjs';
 import { normalizeCacheOptions } from '../../utils/normalize-cache';
 import { purgeStaleBuildCache } from '../../utils/purge-cache';
 import { Schema as NgPackagrBuilderOptions } from './schema';
@@ -58,7 +58,7 @@ export function execute(
     switchMap(({ packager, ngPackagrOptions }) =>
       options.watch ? packager.watch(ngPackagrOptions) : packager.build(ngPackagrOptions),
     ),
-    mapTo({ success: true }),
+    map(() => ({ success: true })),
     catchError((err) => of({ success: false, error: err.message })),
   );
 }