Bump yargs-parser and mocha

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) and [mocha](https://github.com/mochajs/mocha). These dependencies needed to be updated together.

Updates `yargs-parser` from 11.1.1 to 13.1.2
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/main/docs/CHANGELOG-full.md)
- [Commits](https://github.com/yargs/yargs-parser/commits)

Updates `mocha` from 6.1.4 to 6.2.3
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.1.4...v6.2.3)

---
updated-dependencies:
- dependency-name: yargs-parser
  dependency-type: indirect
- dependency-name: mocha
  dependency-type: direct:development
...

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