build(deps-dev): bump electron in /packages/electron Bumps [electron](https://github.com/electron/electron) from 4.2.12 to 9.1.0. - [Release notes](https://github.com/electron/electron/releases) - [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md) - [Commits](https://github.com/electron/electron/compare/v4.2.12...v9.1.0) Signed-off-by: dependabot[bot]