refactor(deps-dev): bump karma from 6.3.3 to 6.3.4
refactor(deps-dev): bump karma from 6.3.3 to 6.3.4

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.3 to 6.3.4.
- [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/v6.3.3...v6.3.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
amclin/videojs-scene7,amclin/videojs-scene7