build(deps-dev): bump karma from 6.3.15 to 6.3.16 in /frontend

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.15 to 6.3.16.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.3.15...v6.3.16)

---
updated-dependencies:
- dependency-name: karma
  dependency-type: direct:development
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -49,7 +49,7 @@
     "express": "4.17.2",
     "jasmine-core": "3.7.1",
     "jasmine-spec-reporter": "6.0.0",
-    "karma": "6.3.15",
+    "karma": "6.3.16",
     "karma-chrome-launcher": "3.1.0",
     "karma-coverage-istanbul-reporter": "3.0.3",
     "karma-jasmine": "4.0.1",