Use ember-data@5.3 in v5.4 scenario

Author: SergeAstapov

packages/ember-cli-mirage/tests/dummy/config/ember-try.js

@@ -51,7 +51,7 @@ module.exports = async function () {
         name: 'ember-lts-5.4',
         npm: {
           devDependencies: {
-            'ember-data': '~5.4.0',
+            'ember-data': '~5.3.0',
             'ember-source': '~5.4.0',
           },
         },