Add CHANGELOG entry for DynamoDB account-based endpoints.

[ewbankkit]

Description

Adds a CHANGELOG note about DynamoDB account-based endpoints.
Also adds a CHANGELOG note for the Go 1.23.1 upgrade (#39432).

Relations

Closes #39503.

[github-actions]

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[jar-b]

LGTM 🚀

[github-actions]

This functionality has been released in v5.69.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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