Update dependency mocha to v6.2.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	6.2.2 -> 6.2.3

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Release Notes

mochajs/mocha

### [`v6.2.3`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​623--2020-03-25) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.2.2...v6.2.3) #### :lock: Security Fixes - [848d6fb8](https://togithub.com/mochajs/mocha/commit/848d6fb8feef659564b296db457312d38176910d): Update dependencies mkdirp, yargs-parser and yargs ([**@​juergba**](https://togithub.com/juergba))

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