Update dependency ember-qunit to v9

Author: renovate[bot]

package.json

@@ -51,7 +51,7 @@
     "ember-load-initializers": "2.1.2",
     "ember-maybe-import-regenerator": "1.0.0",
     "ember-page-title": "8.2.3",
-    "ember-qunit": "8.1.1",
+    "ember-qunit": "9.0.1",
     "ember-resolver": "11.0.1",
     "ember-source": "5.12.0",
     "ember-source-channel-url": "3.0.0",