Bump execa from 3.3.0 to 3.4.0 (#7059)
Bumps [execa](https://github.com/sindresorhus/execa) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](https://github.com/sindresorhus/execa/compare/v3.3.0...v3.4.0)
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