chore(deps-dev): bump karma from 4.3.0 to 6.3.16

Bumps [karma](https://github.com/karma-runner/karma) from 4.3.0 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@v4.3.0...v6.3.16)

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

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

package.json

@@ -76,7 +76,7 @@
     "gh-pages": "^4.0.0",
     "jasmine": "^2.4.1",
     "jasmine-core": "^2.4.1",
-    "karma": "^4.3.0",
+    "karma": "^6.3.16",
     "karma-chrome-launcher": "^3.1.0",
     "karma-cli": "^2.0.0",
     "karma-jasmine": "^0.3.7",