Bump ember-template-lint from 2.4.1 to 2.8.0
Bump ember-template-lint from 2.4.1 to 2.8.0

Bumps [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) from 2.4.1 to 2.8.0.
- [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/compare/v2.4.1...v2.8.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
patience-tema-baron/ember-keyboard,null-null-null/ember-keyboard,null-null-null/ember-keyboard,patience-tema-baron/ember-keyboard