Update dependency mocha to v8.4.0

This MR 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

Compare Source

🎉 Enhancements

• #​4502: CLI file parsing errors now have error codes (@​evaline-ju)

🐛 Fixes

• #​4614: Watch: fix crash when reloading files (@​outsideris)

📖 Documentation

• #​4630: Add options.require to Mocha constructor for root hook plugins on parallel runs (@​juergba)
• #​4617: Dynamically generating tests with top-level await and ESM test files (@​juergba)
• #​4608: Update default file extensions (@​outsideris)

Also thanks to @​outsideris for various improvements on our GH actions workflows.

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