Contributor documentation: Purge references to AWS SDK for Go v1

[ewbankkit]

Description

From July 31 2024 the AWS SDK for Go v1 has been placed in maintenance mode, meaning that the SDK receives only critical bug and security fixes and does not receive API updates for services or support for new AWS Regions. One year later, as of July 31 2025, the SDK will be at end-of-support, with no further updates.
The Terraform AWS Provider has steadily been migrating to the fully supported AWS SDK for Go v2, and thanks to sustained community contributions, at the time of writing (mid-October 2024) migration of resources and data sources for all bar 1 service has been completed. The outstanding migration is the Simple DB service – there is no support in AWS SDK for Go v2 although AWS reports continued usage of the service. We intend to drop support for the aws_simpledb_domain resource at the next major version (v6.0.0) of the Terraform AWS Provider.
The effective completion of the migration allows us to purge references to AWS SDK for Go v1 support from the contributor documentation.

Relations

Relates #32976.

[github-actions]

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