Auto merge of #2085 - Turbo87:ember-component-attributes, r=locks

Remove obsolete `ember-component-attributes` dependency

We are using Angle Bracket Component syntax now, which makes this dependency obsolete. In fact, we no longer use the `html-attributes` helper anywhere at all, so this should be safe to just remove.

r? @locks

Author: bors

package-lock.json

@@ -51,7 +51,6 @@
     "ember-cli-sass": "^10.0.1",
     "ember-cli-sri": "2.1.1",
     "ember-cli-uglify": "^3.0.0",
-    "ember-component-attributes": "^0.1.3",
     "ember-concurrency": "^1.1.3",
     "ember-data": "~3.15.0",
     "ember-disable-prototype-extensions": "^1.1.3",