Update terraform to 1.5.7

[haodeon]

Prepare a 0.6.0 release, building from the last MPL licensed terraform version 1.5.7.

Fixed test workflow failing on Windows.

[haodeon]

Given there are no library changes, only updates to terraform, would it be more appropriate to only bump the patch version to 0.5.1?

I have another branch where terraform is upgraded to 1.6.6. I can raise another PR if this change is accepted.

[Prodesire]

Thanks for contributing. It would be nice to get another PR.