Bump ws and karma

Bumps [ws](https://github.com/websockets/ws) to 8.18.3 and updates ancestor dependency [karma](https://github.com/karma-runner/karma). These dependencies need to be updated together.


Updates `ws` from 3.3.3 to 8.18.3
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@3.3.3...8.18.3)

Updates `karma` from 4.4.1 to 6.4.4
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v4.4.1...v6.4.4)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.18.3
  dependency-type: indirect
- dependency-name: karma
  dependency-version: 6.4.4
  dependency-type: direct:production
...

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Author: dependabot[bot]