Remove AWS SDK for Go v1 references from contributor documentation

[ewbankkit]

Description

Removes AWS SDK for Go v1 references from contributor documentation.

Relations

Relates #32976.

[github-actions]

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[YakDriver]

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[github-actions]

This functionality has been released in v5.74.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.