Bump karma from 4.4.1 to 6.3.0

Bumps [karma](https://github.com/karma-runner/karma) from 4.4.1 to 6.3.0.
- [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...v6.3.0)

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

package.json

@@ -47,7 +47,7 @@
     "grunt-run": "^0.8.1",
     "grunt-webpack": "^3.1.3",
     "jest": "^26.1.0",
-    "karma": "^4.4.1",
+    "karma": "^6.3.0",
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage": "^2.0.1",
     "karma-qunit": "^4.0.0",