r/aws_dx_gateway_association: Call out deprecation of vpn_gateway_id

[ewbankkit]

Description

#12482 deprecated the log_group_name attribute in the resource's Terraform schema but did not call this out in the CHANGELOG (#8528 deprecated the attribute in documentation).
Instead of moving straight to removal in v5.0.0, call out the deprecation and remove in a future (post-v5.0.0) version.

[github-actions]

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[github-actions]

This functionality has been released in v5.0.0 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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[github-actions]

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