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>

Author: dependabot[bot]