Use Go 1.21.8

[ewbankkit]

5 CVEs addressed in Go 1.21.8: https://groups.google.com/g/golang-announce/c/5pwGVUPoMbg?pli=1.

Relates #35832.
Relates #36336.

[github-actions]

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[github-actions]

This functionality has been released in v5.41.0 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]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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