Bump karma from 3.1.4 to 6.2.0

Bumps [karma](https://github.com/karma-runner/karma) from 3.1.4 to 6.2.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v3.1.4...v6.2.0)

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

package.json

@@ -50,7 +50,7 @@
     "codelyzer": "^5.1.2",
     "jasmine-core": "~2.99.1",
     "jasmine-spec-reporter": "~4.2.1",
-    "karma": "~3.1.1",
+    "karma": "~6.2.0",
     "karma-chrome-launcher": "~2.2.0",
     "karma-coverage": "^1.1.2",
     "karma-coverage-istanbul-reporter": "^2.1.1",