Bump cross-spawn and @changesets/cli

Bumps [cross-spawn](https://github.com/moxystudio/node-cross-spawn) to 7.0.6 and updates ancestor dependency [@changesets/cli](https://github.com/changesets/changesets). These dependencies need to be updated together.


Updates `cross-spawn` from 7.0.3 to 7.0.6
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@v7.0.3...v7.0.6)

Updates `@changesets/cli` from 2.26.1 to 2.29.8
- [Release notes](https://github.com/changesets/changesets/releases)
- [Commits](https://github.com/changesets/changesets/commits)

---
updated-dependencies:
- dependency-name: cross-spawn
  dependency-version: 7.0.6
  dependency-type: indirect
- dependency-name: "@changesets/cli"
  dependency-version: 2.29.8
  dependency-type: direct:development
...

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Author: dependabot[bot]