Bumps [github.com/hashicorp/terraform-exec](https://github.com/hashicorp/terraform-exec) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/hashicorp/terraform-exec/releases)
- [Changelog](https://github.com/hashicorp/terraform-exec/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-exec@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/terraform-exec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

…erraform-exec-0.21.0

…erraform-exec-0.21.0