chore(deps): update terraform terraform-aws-modules/iam/aws to v6

[govuk-ci]

This PR contains the following updates:

Package	Type	Update	Change
terraform-aws-modules/iam/aws (source)	module	major	~> 5.20 → ~> 6.0
terraform-aws-modules/iam/aws (source)	module	major	~> 5.28 → ~> 6.0
terraform-aws-modules/iam/aws (source)	module	major	~> 5.0 → ~> 6.0
terraform-aws-modules/iam/aws (source)	module	major	~> 5.27 → ~> 6.0
terraform-aws-modules/iam/aws (source)	module	major	~> 5.5 → ~> 6.0

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Warning

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Release Notes

terraform-aws-modules/terraform-aws-iam (terraform-aws-modules/iam/aws)

v6.2.3

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Bug Fixes

• Use the aws_service_principal data source to retrieve the correct service principal for IRSA policies (#​628) (673fb44)

v6.2.2

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Bug Fixes

• Update CI workflow versions to latest (#​626) (45cc1f8)

v6.2.1

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Bug Fixes

• Correct iam-group variable name mis-spelling (#​610) (cf4e77b)

v6.2.0

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Features

• Implement user inline policy for iam-user (#​607) (1c2dfd7)

v6.1.2

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Bug Fixes

• Modify BitBucket provider URL extraction to be more robust when none or multiple URLs are provided (#​605) (e3e724d)

v6.1.1

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Bug Fixes

• Remove any secretsmanager:* permissions if no secret ARNs are provided to IRSA external-secrets permissions (#​599) (d610954)

v6.1.0

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Features

• Add default IRSA policy name, fix incorrect policy attachment for iam-user (#​594) (f111832)

v6.0.1

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Bug Fixes

• Remove broken IRSA migrations.tf; add default IRSA policy descriptions for backwards compat (#​592) (e56f84d)

v6.0.0

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⚠ BREAKING CHANGES

• Upgrade AWS provider and min required Terraform version to 6.0 and 1.5.7 respectively (#​585)

Features

• Upgrade AWS provider and min required Terraform version to 6.0 and 1.5.7 respectively (#​585) (31b31d7)

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