Change import path for UUIEvent to direct import to fix circular dependency

Author: iOvergaard

packages/uui-base/lib/events/UUISelectableEvent.ts

@@ -1,5 +1,5 @@
-import { UUIEvent } from '../events';
 import { SelectableMixinInterface } from '../mixins';
+import { UUIEvent } from './UUIEvent';
 
 export class UUISelectableEvent extends UUIEvent<{}, SelectableMixinInterface> {
   public static readonly SELECTED = 'selected';