Bump socket.io and karma

Bumps [socket.io](https://github.com/socketio/socket.io) to 4.8.3 and updates ancestor dependency [karma](https://github.com/karma-runner/karma). These dependencies need to be updated together.


Updates `socket.io` from 2.1.1 to 4.8.3
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/main/CHANGELOG.md)
- [Commits](https://github.com/socketio/socket.io/compare/2.1.1...socket.io@4.8.3)

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: socket.io
  dependency-version: 4.8.3
  dependency-type: indirect
- dependency-name: karma
  dependency-version: 6.4.4
  dependency-type: direct:production
...

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Author: dependabot[bot]