fix(deps): update dependency execa to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
execa	^7.2.0 -> ^8.0.1

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Release Notes

sindresorhus/execa (execa)

v8.0.1

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Fixes

• Fix and document support for the {encoding: 'buffer'} option. It is the same as {encoding: null}, but preferred over it. (#​572)

v8.0.0

Compare Source

Breaking

• Require Node.js 16.7.0 and later (#​569)

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