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

@@ -55,7 +55,7 @@
     "expect.js": "^0.3.1",
     "fs-extra": "^8.1.0",
     "json-loader": "^0.5.7",
-    "karma": "^4.4.1",
+    "karma": "^6.3.16",
     "karma-chrome-launcher": "^3.1.0",
     "karma-firefox-launcher": "^1.3.0",
     "karma-ie-launcher": "^1.0.0",