Bump karma from 3.1.3 to 3.1.4 in /build

Bumps [karma](https://github.com/karma-runner/karma) from 3.1.3 to 3.1.4.
- [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/compare/v3.1.3...v3.1.4

)

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