Update dependency ember-qunit to v9 (#10241)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -104,7 +104,7 @@
     "ember-load-initializers": "3.0.1",
     "ember-modifier": "4.2.0",
     "ember-page-title": "8.2.3",
-    "ember-qunit": "8.1.1",
+    "ember-qunit": "9.0.1",
     "ember-resolver": "13.1.0",
     "ember-router-scroll": "4.1.2",
     "ember-source": "6.0.1",