Bump karma-electron from 5.3.0 to 6.3.0

Bumps [karma-electron](https://github.com/twolfson/karma-electron) from 5.3.0 to 6.3.0.
- [Release notes](https://github.com/twolfson/karma-electron/releases)
- [Changelog](https://github.com/twolfson/karma-electron/blob/master/CHANGELOG.md)
- [Commits](https://github.com/twolfson/karma-electron/compare/5.3.0...6.3.0)

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

package.json

@@ -107,7 +107,7 @@
     "karma": "^1.3.0",
     "karma-chai": "^0.1.0",
     "karma-coverage": "^1.1.1",
-    "karma-electron": "^5.1.1",
+    "karma-electron": "^6.3.0",
     "karma-mocha": "^1.2.0",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "^0.0.31",