fix(deps): update module github.com/hashicorp/terraform-exec to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/terraform-exec	v0.17.2 -> v0.21.0

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Release Notes

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

v0.21.0

ENHANCEMENTS:

• tfexec: Add -allow-deferral to (Terraform).Apply() and (Terraform).Plan() methods (#​447)

v0.20.0

ENHANCEMENTS:

• Add JSONNumber option to Show to enable json.Number representation of numerical values in returned tfjson.Plan and tfjson.State values (https://github.com/hashicorp/terraform-exec/pull/427)

v0.19.0

ENHANCEMENTS:

• Add support for terraform test command (#​398)
• Add support for -refresh-only flag for Plan and Apply methods. (#​402)
• Add support for -destroy flag for Apply (#​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)

v0.18.1

BUG FIXES:

• Fix bug in which errors returned from commands such as (Terraform).Apply() were missing stderr output from Terraform. (#​372)

v0.18.0

BREAKING CHANGES:

• The following error types have been removed. These errors were based on regex parsing of Terraform CLI's human-readable output into custom error cases. (#​352)
  • ErrConfigInvalid
  • ErrLockIdInvalid
  • ErrMissingVar
  • ErrNoConfig
  • ErrNoInit
  • ErrNoWorkspace
  • ErrStateLocked
  • ErrStatePlanRead
  • ErrTFVersionMismatch
  • ErrWorkspaceExists

ENHANCEMENTS:

• tfexec: Add (Terraform).ApplyJSON(), (Terraform).DestroyJSON(), (Terraform).PlanJSON() and (Terraform).RefreshJSON() methods (#​354)
• tfexec: Add (Terraform).MetadataFunctions() method (#​358)

v0.17.3

Please note that terraform-exec now requires Go 1.18.

BUG FIXES:

• Fix bug in which terraform init was always called with the -force-copy flag (https://github.com/hashicorp/terraform-exec/issues/268)
• Always pass -no-color flag when calling terraform force-unlock (https://github.com/hashicorp/terraform-exec/issues/270)

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