Bump electron from 6.0.11 to 9.4.0

Bumps [electron](https://github.com/electron/electron) from 6.0.11 to 9.4.0.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md)
- [Commits](electron/electron@v6.0.11...v9.4.0)

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

package.json

@@ -28,7 +28,7 @@
     "@vue/cli-plugin-eslint": "^3.11.0",
     "@vue/cli-service": "^3.11.0",
     "babel-eslint": "^10.0.1",
-    "electron": "6.0.11",
+    "electron": "9.4.0",
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.0.0",
     "material-design-icons-iconfont": "^5.0.1",