build(deps-dev): bump karma from 6.3.20 to 6.4.2

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.20 to 6.4.2.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.3.20...v6.4.2)

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

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

package.json

@@ -84,7 +84,7 @@
     "jasmine-core": "^5.0.0",
     "jasmine-marbles": "^0.6.0",
     "jasmine-spec-reporter": "^7.0.0",
-    "karma": "~6.3.16",
+    "karma": "~6.4.2",
     "karma-chrome-launcher": "~3.2.0",
     "karma-coverage": "~2.0.3",
     "karma-jasmine": "~4.0.0",