chore(*): update karma

This allows us to remove the workaround added in #16645

Author: Narretz

package.json

@@ -62,7 +62,7 @@
     "jquery": "3.2.1",
     "jquery-2.1": "npm:[email protected]",
     "jquery-2.2": "npm:[email protected]",
-    "karma": "^2.0.4",
+    "karma": "3.1.1",
     "karma-browserstack-launcher": "^1.3.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-edge-launcher": "^0.4.2",