chore(deps): commitlint monorepo

Author: renovate-bot

package.json

@@ -39,9 +39,9 @@
     "ember-cli-typescript": "^4.0.0"
   },
   "devDependencies": {
-    "@commitlint/cli": "8.3.5",
-    "@commitlint/config-conventional": "8.3.4",
-    "@commitlint/travis-cli": "8.3.5",
+    "@commitlint/cli": "15.0.0",
+    "@commitlint/config-conventional": "15.0.0",
+    "@commitlint/travis-cli": "15.0.0",
     "@ember/optional-features": "2.0.0",
     "@ember/test-helpers": "2.5.0",
     "@mike-north/js-lib-renovate-config": "1.3.1",