Bump ember-template-lint from 2.7.0 to 2.8.0

Bumps [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) from 2.7.0 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](ember-template-lint/ember-template-lint@v2.7.0...v2.8.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -88,7 +88,7 @@
     "ember-router-scroll": "^2.0.1",
     "ember-source": "~3.18.1",
     "ember-svg-jar": "^2.2.3",
-    "ember-template-lint": "^2.7.0",
+    "ember-template-lint": "^2.8.0",
     "ember-test-selectors": "^4.1.0",
     "ember-truth-helpers": "^2.1.0",
     "ember-web-app": "^4.0.0",