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](https://github.com/karma-runner/karma/compare/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

@@ -40,7 +40,7 @@
     "jasmine-core": "2.5.2",
     "jasmine-jquery": "2.1.1",
     "json-loader": "^0.5.7",
-    "karma": "^4.4.1",
+    "karma": "^6.3.16",
     "karma-chrome-launcher": "2.2.0",
     "karma-coverage": "1.1.2",
     "karma-coverage-istanbul-reporter": "^2.0.4",