Bump karma-electron from 6.3.3 to 6.3.4 in /web

Bumps [karma-electron](https://github.com/twolfson/karma-electron) from 6.3.3 to 6.3.4.
- [Release notes](https://github.com/twolfson/karma-electron/releases)
- [Changelog](https://github.com/twolfson/karma-electron/blob/master/CHANGELOG.md)
- [Commits](twolfson/karma-electron@6.3.3...6.3.4)

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