Update dependency ember-cli-code-coverage to v3

Author: renovate[bot]

ember/package.json

@@ -46,7 +46,7 @@
     "ember-cli": "3.26.0",
     "ember-cli-babel": "7.26.6",
     "ember-cli-bundle-analyzer": "0.2.2",
-    "ember-cli-code-coverage": "1.0.2",
+    "ember-cli-code-coverage": "3.1.0",
     "ember-cli-dependency-checker": "3.2.0",
     "ember-cli-dependency-lint": "2.0.0",
     "ember-cli-deploy": "1.0.2",