chore(deps-dev): bump karma from 5.2.3 to 6.0.0

Bumps [karma](https://github.com/karma-runner/karma) from 5.2.3 to 6.0.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v5.2.3...v6.0.0)

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

package.json

@@ -48,7 +48,7 @@
     "eslint": "^7.8.1",
     "js-beautify": "^1.7.4",
     "json-schema-test": "^2.0.0",
-    "karma": "^5.0.0",
+    "karma": "^6.0.0",
     "karma-mocha": "^2.0.0",
     "karma-phantomjs-launcher": "^1.0.0",
     "mocha": "^8.0.1",