Update karma-coverage requirement in /webpack/code-splitting

Updates the requirements on [karma-coverage](https://github.com/karma-runner/karma-coverage) to permit the latest version.
- [Release notes](https://github.com/karma-runner/karma-coverage/releases)
- [Changelog](https://github.com/karma-runner/karma-coverage/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma-coverage@v1.1.1...v2.0.1)

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

Author: dependabot-preview[bot]

webpack/code-splitting/package.json

@@ -40,7 +40,7 @@
     "jasmine-core": "2.5.2",
     "karma": "1.4.1",
     "karma-chrome-launcher": "2.0.0",
-    "karma-coverage": "1.1.1",
+    "karma-coverage": "2.0.1",
     "karma-jasmine": "1.1.0",
     "karma-mocha-reporter": "2.2.2",
     "karma-remap-istanbul": "0.6.0",