[Snyk] Upgrade karma from 6.3.16 to 6.4.2 (#381)

Snyk has created this PR to upgrade karma from 6.3.16 to 6.4.2.

See this package in npm:
https://www.npmjs.com/package/karma

See this project in Snyk:
https://app.snyk.io/org/chia-network/project/e887fc45-cae4-47fc-931a-813664d517cd?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>
Co-authored-by: William Allen <wallentx@users.noreply.github.com>