build(deps-dev): bump karma from 4.1.0 to 4.2.0

Bumps [karma](https://github.com/karma-runner/karma) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v4.1.0...v4.2.0)

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

Author: dependabot-preview[bot]