build(deps-dev): bump karma from 1.7.1 to 6.3.16

Bumps [karma](https://github.com/karma-runner/karma) from 1.7.1 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@1.7.1...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

@@ -32,7 +32,7 @@
     "jasmine-core": "^2.99.1",
     "jit-grunt": "^0.9.1",
     "jshint-stylish": "^1.0.0",
-    "karma": "^1.7.1",
+    "karma": "^6.3.16",
     "karma-jasmine": "^1.1.2",
     "karma-phantomjs-launcher": "^1.0.4",
     "phantomjs-prebuilt": "^2.1.16",