fix: Update syntax for Terraform 0.15

[antonbabenko]

No description provided.

[antonbabenko]

@barryib I have added a couple of fixes related to Terraform 0.15 syntax while making these kinds of changes in other repositories, and wonder if you also want to use the same flow with GH Actions developed by @bryantbiggs ? We are using it since last week on most of others repositories (for example, https://github.com/terraform-aws-modules/terraform-aws-lambda/blob/master/.github/workflows/pre-commit.yml).

It would be very nice for us to use the same process across all repos in this organization. Bryant's solution allows to have multiple versions for examples, modules, root dir and terraform_validate will be executed for the lowest supported version, while the complete set of pre-commit hooks is executed with the maximum supported version of Terraform.

[TjeuKayim]

This seems to be a partial duplicate of my pull request #1165 that replaces the use of deprecated functions list() and map() with the new syntax.

[antonbabenko]

@TjeuKayim I see it now, I will be able to rebase this one after yours is merged.

[mbevc1]

0.15 was released today 🥳
Could we get those PRs merged?

[antonbabenko]

For the Terraform 0.15 users v15.1.0 has been just released.

[mbevc1]

Cheers @antonbabenko 🎉 . Any reason it was just tagged and not released?

[antonbabenko]

Very good question! I was not entirely sure about the release process for this module and followed the process I have for all other terraform-aws-modules.

We will have to ask @barryib to make a release the way he does it normally.

[github-actions]

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