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

@@ -79,7 +79,7 @@
     "chai-shallow-deep-equal": "^1.4.6",
     "cross-env": "7.0.3",
     "ghpages": "^0.0.10",
-    "karma": "^4.4.1",
+    "karma": "^6.3.16",
     "karma-browserify": "^4.4.2",
     "karma-chai-shallow-deep-equal": "0.0.4",
     "karma-chrome-launcher": "2.0.0",