chore(deps-dev): bump karma from 5.1.1 to 6.1.1 (#284)

Bumps [karma](https://github.com/karma-runner/karma) from 5.1.1 to 6.1.1.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v5.1.1...v6.1.1)

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Author: dependabot[bot]