Update karma requirement to ^2.0.2 in /build

Updates the requirements on [karma](https://github.com/karma-runner/karma) to permit the latest version.
- [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/commits/v2.0.2

)

Signed-off-by: dependabot[bot] <support@dependabot.com>