chore(deps): update dependency mocha to v8.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mocha (source)	8.3.2 -> 8.4.0

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Release Notes

mochajs/mocha

### [`v8.4.0`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​840--2021-05-07) [Compare Source](https://togithub.com/mochajs/mocha/compare/v8.3.2...v8.4.0) #### :tada: Enhancements - [#​4502](https://togithub.com/mochajs/mocha/issues/4502): CLI file parsing errors now have error codes ([**@​evaline-ju**](https://togithub.com/evaline-ju)) #### :bug: Fixes - [#​4614](https://togithub.com/mochajs/mocha/issues/4614): Watch: fix crash when reloading files ([**@​outsideris**](https://togithub.com/outsideris)) #### :book: Documentation - [#​4630](https://togithub.com/mochajs/mocha/issues/4630): Add `options.require` to Mocha constructor for `root hook` plugins on parallel runs ([**@​juergba**](https://togithub.com/juergba)) - [#​4617](https://togithub.com/mochajs/mocha/issues/4617): Dynamically generating tests with `top-level await` and ESM test files ([**@​juergba**](https://togithub.com/juergba)) - [#​4608](https://togithub.com/mochajs/mocha/issues/4608): Update default file extensions ([**@​outsideris**](https://togithub.com/outsideris)) Also thanks to [**@​outsideris**](https://togithub.com/outsideris) for various improvements on our GH actions workflows.

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