chore(deps): update dependency execa to ^4.0.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
execa	devDependencies	patch	^4.0.1 -> ^4.0.2

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Release Notes

sindresorhus/execa

### [`v4.0.2`](https://togithub.com/sindresorhus/execa/releases/v4.0.2) [Compare Source](https://togithub.com/sindresorhus/execa/compare/v4.0.1...v4.0.2) ### Bug fixes - Fix with third-party promises (like `bluebird`) not working ([#​427](https://togithub.com/sindresorhus/execa/issues/427))

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