Bump ember-template-lint from 1.12.1 to 1.12.3

Bumps [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) from 1.12.1 to 1.12.3.
- [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@v1.12.1...v1.12.3)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -70,7 +70,7 @@
     "ember-promise-helpers": "^1.0.9",
     "ember-resolver": "^7.0.0",
     "ember-router-scroll": "^1.3.3",
-    "ember-template-lint": "^1.12.1",
+    "ember-template-lint": "^1.12.3",
     "ember-source": "~3.15.0",
     "ember-svg-jar": "^2.2.3",
     "ember-test-selectors": "^3.0.0",