Bump karma-coverage from 2.1.1 to 2.2.0 in /frontend

Bumps [karma-coverage](https://github.com/karma-runner/karma-coverage) from 2.1.1 to 2.2.0.
- [Release notes](https://github.com/karma-runner/karma-coverage/releases)
- [Changelog](https://github.com/karma-runner/karma-coverage/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma-coverage/compare/v2.1.1...v2.2.0)

---
updated-dependencies:
- dependency-name: karma-coverage
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

frontend/package.json

@@ -34,7 +34,7 @@
     "jasmine-core": "~4.0.0",
     "karma": "~6.3.0",
     "karma-chrome-launcher": "~3.1.0",
-    "karma-coverage": "~2.1.0",
+    "karma-coverage": "~2.2.0",
     "karma-jasmine": "~4.0.0",
     "karma-jasmine-html-reporter": "~1.7.0",
     "typescript": "~4.5.2"