chore: update dependency mocha to ^6.2.3 (5.x)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mocha (source)	^6.2.0 -> ^6.2.3

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Release Notes

mochajs/mocha (mocha)

v6.2.3

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🔒 Security Fixes

• 848d6fb8: Update dependencies mkdirp, yargs-parser and yargs (@​juergba)

v6.2.2

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🐛 Fixes

• #​4025: Fix duplicate EVENT_RUN_END events upon uncaught exception (@​juergba)
• #​4051: Fix "unhide" function in html reporter (browser) (@​pec9399)
• #​4063: Fix use of esm in Node.js v8.x (@​boneskull)
• #​4033: Fix output when multiple async exceptions are thrown (@​juergba)

📖 Documentation

• #​4046: Site accessibility fixes (@​Mia-jeong)
• #​4026: Update docs for custom reporters in browser (@​Lindsay-Needs-Sleep)
• #​3971: Adopt new OpenJS Foundation Code of Conduct (@​craigtaub)

v6.2.1

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🐛 Fixes

• #​3955: tty.getWindowSize is not a function inside a "worker_threads" worker (@​1999)
• #​3970: remove extraGlobals() (@​juergba)
• #​3984: Update yargs-unparser to v1.6.0 (@​juergba)
• #​3983: Package 'esm': spawn child-process for correct loading (@​juergba)
• #​3986: Update yargs to v13.3.0 and yargs-parser to v13.1.1 (@​juergba)

📖 Documentation

• #​3886: fix styles on mochajs.org (@​outsideris)
• #​3966: Remove jsdoc index.html placeholder from eleventy file structure and fix broken link in jsdoc tutorial (@​Munter)
• #​3765: Add Matomo to website (@​MarioDiaz98)
• #​3947: Clarify effect of .skip() (@​oliversalzburg)

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