chore(showcase): remove ember-unique-id-helper-polyfill

Author: aklkv

pnpm-lock.yaml

@@ -101,7 +101,6 @@
     "ember-template-lint": "^7.7.0",
     "ember-truth-helpers": "^4.0.3",
     "ember-try": "^4.0.0",
-    "ember-unique-id-helper-polyfill": "^1.2.2",
     "eslint": "^9.27.0",
     "eslint-config-prettier": "^10.1.5",
     "eslint-plugin-ember": "^12.5.0",