chore(deps): update dependency mocha to ^8.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	^8.1.0 -> ^8.1.1

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Release Notes

mochajs/mocha

### [`v8.1.1`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​811--2020-08-04) [Compare Source](https://togithub.com/mochajs/mocha/compare/v8.1.0...v8.1.1) #### :bug: Fixes - [#​4394](https://togithub.com/mochajs/mocha/issues/4394): Fix regression wherein certain reporters did not correctly detect terminal width ([**@​boneskull**](https://togithub.com/boneskull))

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