Bump karma from 6.1.1 to 6.2.0 (#339)

Bumps [karma](https://github.com/karma-runner/karma) from 6.1.1 to 6.2.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.1.1...v6.2.0)

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