Update ember-template-lint requirement in /test-app

Updates the requirements on [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) to permit the latest version.
- [Release notes](https://github.com/ember-template-lint/ember-template-lint/releases)
- [Changelog](https://github.com/ember-template-lint/ember-template-lint/blob/master/CHANGELOG.md)
- [Commits](ember-template-lint/ember-template-lint@v5.7.2...v5.11.0)

---
updated-dependencies:
- dependency-name: ember-template-lint
  dependency-type: direct:development
...

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

test-app/package.json

@@ -61,7 +61,7 @@
     "ember-resolver": "^10.0.0",
     "ember-source": "~4.12.0",
     "ember-source-channel-url": "^3.0.0",
-    "ember-template-lint": "^5.7.2",
+    "ember-template-lint": "^5.11.0",
     "ember-try": "^2.0.0",
     "eslint": "^8.40.0",
     "eslint-config-prettier": "^8.8.0",