Bump terraform-aws-modules/iam/aws from 5.54.1 to 5.55.0 in /iac/setup

Bumps [terraform-aws-modules/iam/aws](https://github.com/terraform-aws-modules/terraform-aws-iam) from 5.54.1 to 5.55.0.
- [Release notes](https://github.com/terraform-aws-modules/terraform-aws-iam/releases)
- [Changelog](https://github.com/terraform-aws-modules/terraform-aws-iam/blob/master/CHANGELOG.md)
- [Commits](terraform-aws-modules/terraform-aws-iam@v5.54.1...v5.55.0)

---
updated-dependencies:
- dependency-name: terraform-aws-modules/iam/aws
  dependency-version: 5.55.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

iac/setup/setup.tf

@@ -70,7 +70,7 @@ resource "aws_ssm_parameter" "some_secret" {
 
 module "gha_role" {
   source                         = "terraform-aws-modules/iam/aws//modules/iam-assumable-role-with-oidc"
-  version                        = "5.54.1"
+  version                        = "5.55.0"
   create_role                    = true
   role_name                      = "${local.name}-${var.env}-gha"
   provider_url                   = module.acs.github_oidc_provider.url