build: bump cross-platform-actions/action from 0.19.0 to 0.21.0

build: bump cross-platform-actions/action from 0.19.0 to 0.21.0

Bumps [cross-platform-actions/action](https://github.com/cross-platform-actions/action) from 0.19.0 to 0.21.0.
- [Release notes](https://github.com/cross-platform-actions/action/releases)
- [Changelog](https://github.com/cross-platform-actions/action/blob/master/changelog.md)
- [Commits](https://github.com/cross-platform-actions/action/compare/v0.19.0...v0.21.0)

---
updated-dependencies:
- dependency-name: cross-platform-actions/action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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