Bump electron from 2.0.18 to 9.4.0

Bumps [electron](https://github.com/electron/electron) from 2.0.18 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@v2.0.18...v9.4.0)

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

package.json

@@ -36,7 +36,7 @@
   "devDependencies": {
     "@lerna/version": "^3.13.1",
     "chai": "^4.1.2",
-    "electron": "^2.0.0",
+    "electron": "^9.4.0",
     "fs-extra": "^7.0.0",
     "jquery": "^3.3.1",
     "karma": "^2.0.2",