Bump grunt-karma from 2.0.0 to 4.0.0

Bumps [grunt-karma](https://github.com/karma-runner/grunt-karma) from 2.0.0 to 4.0.0.
- [Release notes](https://github.com/karma-runner/grunt-karma/releases)
- [Changelog](https://github.com/karma-runner/grunt-karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/grunt-karma@v2.0.0...v4.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -13,7 +13,7 @@
     "grunt-contrib-uglify": "^1.0.1",
     "grunt-contrib-watch": "^1.0.0",
     "grunt-jsdoc": "^2.1.0",
-    "grunt-karma": "^2.0.0",
+    "grunt-karma": "^4.0.0",
     "karma": "^1.1.1"
   },
   "repository": {