Update minimum Terraform AWS provider version to v6.21.0

[Copilot]

Updates the minimum required AWS provider version from v5.32.0 to v6.21.0 across the module and examples.

Changes

• Main module (versions.tf): Updated AWS provider constraint from >= 5.32.0 to >= 6.21.0
• Example (examples/01_default_configuration/versions.tf): Updated constraint from ~>5.59 to ~>6.21
• Documentation: Regenerated README files via terraform-docs to reflect new version requirements

Validation

Tested with terraform init and terraform validate - successfully resolves to AWS provider v6.27.0.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkpoint-api.hashicorp.com
  • Triggering command: /usr/bin/terraform terraform fmt -check -recursive (dns block)
  • Triggering command: /usr/bin/terraform terraform fmt -recursive (dns block)
  • Triggering command: /usr/bin/terraform terraform init (dns block)
• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update the minimum Terraform Provider for AWS version to v6.21.0</issue_title>
<issue_description>Update the provider version, examples and also the documentation.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update the minimum Terraform Provider for AWS version to v6.21.0 #19

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