fix(deps): update dependency execa to v6 (master)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
execa	^5.0.0 -> ^6.0.0

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Release Notes

sindresorhus/execa

### [`v6.0.0`](https://togithub.com/sindresorhus/execa/releases/v6.0.0) [Compare Source](https://togithub.com/sindresorhus/execa/compare/v5.1.1...v6.0.0) ##### Breaking - Require Node.js 12.20 ([#​478](https://togithub.com/sindresorhus/execa/issues/478)) [`7707880`](https://togithub.com/sindresorhus/execa/commit/7707880) - This package is now pure ESM. **Please [read this](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).** - Moved from a default export to named exports. - `require('execa')` → `import {execa} from 'execa'` - `require('execa').sync` → `import {execaSync} from 'execa'` - `require('execa').command` → `import {execaCommand} from 'execa'` - `require('execa').commandSync` → `import {execaCommandSync} from 'execa'` - `require('execa').node` → `import {execaNode} from 'execa'`

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