Bump electron from 1.6.11 to 7.2.4

Bumps [electron](https://github.com/electron/electron) from 1.6.11 to 7.2.4.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md)
- [Commits](electron/electron@v1.6.11...v7.2.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]