Bump log4js and @types/karma

Bumps [log4js](https://github.com/log4js-node/log4js-node) to 6.9.1 and updates ancestor dependency [@types/karma](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/karma). These dependencies need to be updated together.


Updates `log4js` from 4.5.1 to 6.9.1
- [Changelog](https://github.com/log4js-node/log4js-node/blob/master/CHANGELOG.md)
- [Commits](log4js-node/log4js-node@v4.5.1...v6.9.1)

Updates `@types/karma` from 4.4.4 to 6.3.8
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/karma)

---
updated-dependencies:
- dependency-name: log4js
  dependency-type: indirect
- dependency-name: "@types/karma"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]