Update grunt-karma requirement from ^2.0.0 to ^3.0.0
Update grunt-karma requirement from ^2.0.0 to ^3.0.0

Updates the requirements on [grunt-karma](https://github.com/karma-runner/grunt-karma) to permit the latest version.
- [Release notes](https://github.com/karma-runner/grunt-karma/releases)
- [Changelog](https://github.com/karma-runner/grunt-karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/grunt-karma/compare/v2.0.0...v3.0.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
square/js-jose