fix: Remove unused 'hasMany' import in auth-method mirage

ui/core/mirage/models/auth-method.js

@@ -1,4 +1,4 @@
-import { Model, belongsTo, hasMany} from 'ember-cli-mirage';
+import { Model, belongsTo } from 'ember-cli-mirage';
 
 export default Model.extend({