Bump karma from 4.4.1 to 6.3.16

Bumps [karma](https://github.com/karma-runner/karma) from 4.4.1 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@v4.4.1...v6.3.16)

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

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

package.json

@@ -251,7 +251,7 @@
     "htmlhint": "^1.1.4",
     "jasmine-core": "^3.3.0",
     "jasmine-spec-reporter": "^4.2.0",
-    "karma": "^4.0.1",
+    "karma": "^6.3.16",
     "karma-chrome-launcher": "^2.2.0",
     "karma-cli": "^1.0.1",
     "karma-coverage-istanbul-reporter": "^2.1.1",