Bump ember-template-lint from 5.11.0 to 6.1.0 in /smoke-test-app

Bumps [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) from 5.11.0 to 6.1.0.
- [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](https://github.com/ember-template-lint/ember-template-lint/commits)

---
updated-dependencies:
- dependency-name: ember-template-lint
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>