Update dependency mocha to v8.1.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	8.1.2 -> 8.1.3

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Release Notes

mochajs/mocha

v8.1.3

Compare Source

🐛 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)

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[coveralls]

Coverage remained the same at 96.154% when pulling 251fb58 on renovate/mocha-8.x into c8f95cb on master.