fix(deps): update module github.com/hashicorp/terraform-exec to v0.19.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/terraform-exec	require	minor	v0.18.1 -> v0.19.0

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Release Notes

hashicorp/terraform-exec (github.com/hashicorp/terraform-exec)

### [`v0.19.0`](https://togithub.com/hashicorp/terraform-exec/releases/tag/v0.19.0) [Compare Source](https://togithub.com/hashicorp/terraform-exec/compare/v0.18.1...v0.19.0) ENHANCEMENTS: - Add support for `terraform test` command ([#​398](https://togithub.com/hashicorp/terraform-exec/issues/398)) - Add support for `-refresh-only` flag for `Plan` and `Apply` methods. ([#​402](https://togithub.com/hashicorp/terraform-exec/issues/402)) - Add support for `-destroy` flag for `Apply` ([#​292](https://togithub.com/hashicorp/terraform-exec/issues/292)) BUG FIXES: - Fix bug in which the `TF_WORKSPACE` env var was set to an empty string, instead of being unset as intended. ([#​388](https://togithub.com/hashicorp/terraform-exec/issues/388))

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