chore(deps-dev): bump ember-cli-code-coverage (#3917)

Bumps [ember-cli-code-coverage](https://github.com/kategengler/ember-cli-code-coverage) from 1.0.0-beta.3 to 1.0.0-beta.8.
- [Release notes](https://github.com/kategengler/ember-cli-code-coverage/releases)
- [Changelog](https://github.com/kategengler/ember-cli-code-coverage/blob/master/CHANGELOG.md)
- [Commits](ember-cli-code-coverage/ember-cli-code-coverage@v1.0.0-beta.3...v1.0.0-beta.8)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -40,7 +40,7 @@
     "ember-cli-babel": "^7.13.2",
     "ember-cli-cjs-transform": "^2.0.0",
     "ember-cli-clipboard": "^0.11.1",
-    "ember-cli-code-coverage": "^1.0.0-beta.0",
+    "ember-cli-code-coverage": "^1.0.0-beta.8",
     "ember-cli-content-security-policy": "^1.1.1",
     "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-deploy": "^1.0.0",