chore: 🤖 upgrade ember-cli version (#2533)

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-15393

addons/api/package.json

@@ -47,7 +47,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^8.0.1",
     "doctoc": "^2.2.0",
-    "ember-cli": "^4.12.2",
+    "ember-cli": "^5.12.0",
     "ember-cli-dependency-checker": "^3.3.2",
     "ember-cli-inject-live-reload": "^2.1.0",
     "ember-cli-sri": "^2.1.1",