chore(deps-dev): bump @clark/eslint-config-ember-typescript

Bumps [@clark/eslint-config-ember-typescript](https://github.com/ClarkSource/eslint-config) from 1.6.0 to 1.15.1.
- [Release notes](https://github.com/ClarkSource/eslint-config/releases)
- [Commits](ClarkSource/eslint-config@v1.6.0...v1.15.1)

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

package.json

@@ -40,7 +40,7 @@
     "ember-cli-version-checker": "^3.1.3"
   },
   "devDependencies": {
-    "@clark/eslint-config-ember-typescript": "^1.6.0",
+    "@clark/eslint-config-ember-typescript": "^1.15.1",
     "@clark/eslint-config-node": "^1.8.0",
     "@ember/optional-features": "^1.1.0",
     "@types/ember": "^3.1.1",