service/redshift: updates to pass semgrep rule prefer-aws-go-sdk-pointer-conversion-assignment

[anGie44]

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Relates #12992

Output from acceptance testing:

$ semgrep
Running 31 rules...
100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████|31/31
ran 31 rules on 2344 files: 0 findings

[ewbankkit]

LGTM 🚀.

[github-actions]

This functionality has been released in v4.13.0 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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