Update Terraform terraform-aws-modules/iam/aws to v3.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terraform-aws-modules/iam/aws (source)	terraform	minor	3.7.0 -> 3.9.0

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Release Notes

terraform-aws-modules/terraform-aws-iam

### [`v3.9.0`](https://togithub.com/terraform-aws-modules/terraform-aws-iam/blob/master/CHANGELOG.md#v390---2021-02-20) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-iam/compare/v3.8.0...v3.9.0) - chore: update documentation based on latest `terraform-docs` which includes module and resource sections ([#​131](https://togithub.com/terraform-aws-modules/terraform-aws-iam/issues/131)) ### [`v3.8.0`](https://togithub.com/terraform-aws-modules/terraform-aws-iam/blob/master/CHANGELOG.md#v380---2021-01-29) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-iam/compare/v3.7.0...v3.8.0) - feat: Add arn of created group(s) to outputs ([#​128](https://togithub.com/terraform-aws-modules/terraform-aws-iam/issues/128))

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