Bump execa from 8.0.1 to 9.4.0

Bumps [execa](https://github.com/sindresorhus/execa) from 8.0.1 to 9.4.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v8.0.1...v9.4.0)

---
updated-dependencies:
- dependency-name: execa
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]