Update eslint-plugin-ember requirement in /test-app

Updates the requirements on [eslint-plugin-ember](https://github.com/ember-cli/eslint-plugin-ember) to permit the latest version.
- [Release notes](https://github.com/ember-cli/eslint-plugin-ember/releases)
- [Changelog](https://github.com/ember-cli/eslint-plugin-ember/blob/master/CHANGELOG.md)
- [Commits](ember-cli/eslint-plugin-ember@v11.5.0...v11.6.0)

---
updated-dependencies:
- dependency-name: eslint-plugin-ember
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

test-app/package.json

@@ -65,7 +65,7 @@
     "ember-try": "^2.0.0",
     "eslint": "^8.39.0",
     "eslint-config-prettier": "^8.8.0",
-    "eslint-plugin-ember": "^11.5.0",
+    "eslint-plugin-ember": "^11.6.0",
     "eslint-plugin-n": "^15.7.0",
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-qunit": "^7.3.4",