Fix deprecated import path

Author: Turbo87

addon/index.js

@@ -3,7 +3,7 @@
 @submodule ember-runtime
 */
 import Cache from './cache';
-import { deprecate } from '@ember/application/deprecations';
+import { deprecate } from '@ember/debug';
 
 
 // STATE within a module is frowned upon, this exists