Update dependency mocha to ^8.1.3

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
mocha (source)	devDependencies	patch	^8.1.3	homepage, source
@types/mocha	devDependencies	patch	8.0.3	source

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Release Notes

mochajs/mocha

v8.1.3

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🐛 Fixes

• #​4425: Restore Mocha.utils.lookupFiles() and Webpack compatibility (both broken since v8.1.0); Mocha.utils.lookupFiles() is now deprecated and will be removed in the next major revision of Mocha; use require('mocha/lib/cli').lookupFiles instead (@​boneskull)

v8.1.2

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🐛 Fixes

• #​4418: Fix command-line flag incompatibility in forthcoming Node.js v14.9.0 (@​boneskull)
• #​4401: Fix missing global variable in browser (@​irrationnelle)

🔒 Security Fixes

• #​4396: Update many dependencies (@​GChuf)

📖 Documentation

• Various fixes by @​sujin-park, @​wwhurin & @​Donghoon759

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