bump terraform-exec to 0.13.3

[kmoe]

Upgrade terraform-exec from v0.13.0 to v0.13.3.

Changelog:

0.13.3 (April 23, 2021)

SECURITY:

• tfinstall: The HashiCorp PGP signing key has been rotated (HCSEC-2021-12). This key is used to verify downloaded versions of Terraform. We recommend all users of terraform-exec upgrade to v0.13.3 for this security fix. (#166)

N.B. Versions of terraform-exec prior to v0.13.3 will continue to verify older versions of Terraform (up to and including v0.15.0) for a limited period. Installation of Terraform using older versions of terraform-exec will stop working soon, and we recommend upgrading as soon as possible to avoid any interruption.

0.13.2 (April 06, 2021)

BUG FIXES:

• Update terraform-json to support 0.15 changes in plan & config JSON output (#153)
• Update go-getter to prevent race conditions where consumers would require go-cleanhttp >=0.5.2 (which tfexec itself didn't depend on until now) (#154)

0.13.1 (March 29, 2021)

BUG FIXES:

• Bump version of terraform-json library to handle latest Terraform 0.15 output format (#143)

NOTES:

• This release no longer supports Go 1.12 (1.13+ is required)

This change needs to be backported to v1-maint via terraform-plugin-test.

Needs #751 or for the internal/vault/helper tests to be fixed.

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