chore(deps): update dependency ember-cli to v6

Author: renovate[bot]

packages/test-app/package.json

@@ -68,7 +68,7 @@
     "concurrently": "8.2.2",
     "documentation": "14.0.3",
     "ember-auto-import": "2.7.4",
-    "ember-cli": "4.12.3",
+    "ember-cli": "6.6.0",
     "ember-cli-app-version": "7.0.0",
     "ember-cli-babel": "8.2.0",
     "ember-cli-dependency-checker": "3.3.3",