Bump karma from 4.4.1 to 6.4.1

Bumps [karma](https://github.com/karma-runner/karma) from 4.4.1 to 6.4.1.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v4.4.1...v6.4.1)

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

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

package.json

@@ -86,7 +86,7 @@
     "jasmine": "^3.9.0",
     "jasmine-core": "~3.5.0",
     "jasmine-spec-reporter": "~5.0.0",
-    "karma": "~5.0.0",
+    "karma": "~6.4.1",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "~3.0.2",
     "karma-firefox-launcher": "^2.1.1",