Update Terraform terraform-aws-modules/iam/aws to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terraform-aws-modules/iam/aws (source)	module	major	3.16.0 -> 4.1.0

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Release Notes

terraform-aws-modules/terraform-aws-iam

### [`v4.1.0`](https://togithub.com/terraform-aws-modules/terraform-aws-iam/blob/master/CHANGELOG.md#v410---2021-05-03) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-iam/compare/v4.0.0...v4.1.0) - feat: Add support tags to additional IAM modules ([#​144](https://togithub.com/terraform-aws-modules/terraform-aws-iam/issues/144)) - chore: update CI/CD to use stable `terraform-docs` release artifact and discoverable Apache2.0 license ([#​151](https://togithub.com/terraform-aws-modules/terraform-aws-iam/issues/151)) ### [`v4.0.0`](https://togithub.com/terraform-aws-modules/terraform-aws-iam/blob/master/CHANGELOG.md#v400---2021-04-26) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-iam/compare/v3.16.0...v4.0.0) - feat: Shorten outputs (removing this\_) ([#​150](https://togithub.com/terraform-aws-modules/terraform-aws-iam/issues/150))

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