Bump karma from 6.0.2 to 6.0.4 (#32959)

Bump karma from 6.0.2 to 6.0.4 (#32959)

Bumps [karma](https://github.com/karma-runner/karma) from 6.0.2 to 6.0.4.
- [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/v6.0.2...v6.0.4)

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