[skip ci]: Bump karma from 5.2.3 to 6.1.0 (#3439)

Bumps [karma](https://github.com/karma-runner/karma) from 5.2.3 to 6.1.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v5.2.3...v6.1.0)

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