resource/aws_backup_region_settings: Fix error in acceptance test

[gdavison]

Description

Some time between 29 March and 12 April, AWS added Redshift Serverless to aws_backup_region_settings. This caused acceptance tests to fail.

Output from Acceptance Testing

% make testacc PKG=backup TESTS=TestAccBackupRegionSettings_serial

--- PASS: TestAccBackupRegionSettings_serial (26.48s)
    --- PASS: TestAccBackupRegionSettings_serial/basic (26.47s)

[github-actions]

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[ewbankkit]

LGTM 🚀.

[github-actions]

Warning

This Issue has been closed, meaning that any additional comments are much easier for the maintainers to miss. Please assume that the maintainers will not see them.

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[github-actions]

This functionality has been released in v5.98.0 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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