Bump mocha from 3.5.3 to 8.2.1 (#124)

Bumps [mocha](https://github.com/mochajs/mocha) from 3.5.3 to 8.2.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v3.5.3...v8.2.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>