S3 Backend: Support authentication via `aws login`

[ewbankkit]

Terraform Version

# All supported versions.

Use Cases

AWS recently released a "simplified developer" authentication workflow via the AWS CLI's aws login command.
Support this authentication mechanism in the S3 backend.

Attempted Solutions

n/a

Proposal

Will require an updated https://github.com/hashicorp/aws-sdk-go-base version and recompilation of the Terraform CLI.

References

• Announcement
• Blog post

Requires AWS SDK for Go v2 Release 2025-11-19.2 or later.

Relates hashicorp/terraform-provider-aws#45316.
Relates aws/aws-sdk-go-v2#3230.

[SoulPancake]

Is there an issue opened for https://github.com/hashicorp/aws-sdk-go-base @ewbankkit ?