Bumps [karma](https://github.com/karma-runner/karma) from 1.7.1 to 4.0.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v1.7.1...v4.0.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>