fixup! fix(cdk-experimental/ui-patterns): listbox selection fixes

Author: wagnermaciel

src/cdk-experimental/ui-patterns/listbox/listbox.spec.ts

@@ -10,7 +10,7 @@ import {signal} from '@angular/core';
 import {ListboxInputs, ListboxPattern} from './listbox';
 import {OptionPattern} from './option';
 import {createKeyboardEvent} from '@angular/cdk/testing/private';
-import {ModifierKeys} from '@angular/cdk/testing/test-element';
+import {ModifierKeys} from '@angular/cdk/testing';
 
 type TestInputs = ListboxInputs<string>;
 type TestOption = OptionPattern<string>;