fixup! build: update to rxjs 7

Author: alan-agius4

packages/angular/cli/src/commands/update/schematic/index_spec.ts

@@ -9,6 +9,7 @@
 import { normalize, virtualFs } from '@angular-devkit/core';
 import { HostTree } from '@angular-devkit/schematics';
 import { SchematicTestRunner, UnitTestTree } from '@angular-devkit/schematics/testing';
+import { lastValueFrom } from 'rxjs';
 import { map } from 'rxjs/operators';
 import * as semver from 'semver';
 import { angularMajorCompatGuarantee } from './index';
@@ -94,15 +95,15 @@ describe('@schematics/update', () => {
       ),
     );
 
-    const newTree = await schematicRunner
-      .runSchematicAsync(
+    const newTree = await lastValueFrom(
+      schematicRunner.runSchematicAsync(
         'update',
         {
           packages: ['@angular-devkit-tests/update-base'],
         },
         tree,
-      )
-      .toPromise();
+      ),
+    );
     const { dependencies } = JSON.parse(newTree.readContent('/package.json'));
     expect(dependencies['@angular-devkit-tests/update-base']).toBe('1.1.0');
   });