fixed EmberObject APIs usage deprecation issue: https://rfcs.emberjs.com/id/1026-ember-data-deprecate-store-extends-ember-object/

Author: michaelchadwick

packages/frontend/ember-cli-build.js

@@ -15,9 +15,11 @@ module.exports = async function (defaults) {
     // fingerprint: {
     //   extensions: broccoliAssetRevDefaults.extensions.concat(['webmanifest', 'svg']),
     // },
-    // emberData: {
-    //   compatWith: '5.2',
-    // },
+    emberData: {
+      deprecations: {
+        DEPRECATE_STORE_EXTENDS_EMBER_OBJECT: false,
+      },
+    },
 
     hinting: isTestBuild,
     babel: {