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>

Author: dependabot[bot]

package.json

@@ -46,7 +46,7 @@
     "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.2.0",
     "jasmine-core": "^3.2.1",
-    "karma": "^4.4.1",
+    "karma": "^6.3.16",
     "karma-coverage": "^2.0.1",
     "karma-jasmine": "^2.0.1",
     "karma-phantomjs-launcher": "^1.0.4",