Add support for storage_throughput attribute

[take-five]

Hi, AWS recently added support for gp3 storage type in RDS: https://aws.amazon.com/about-aws/whats-new/2022/11/amazon-rds-general-purpose-gp3-storage-volumes/

Terraform AWS provider also released support for it in version 4.45.0.

Would it be possible to add support for it in this module as well?

Is your request related to a new offering from AWS?

Is this functionality available in the AWS provider for Terraform? See CHANGELOG.md, too.

• No 🛑: please wait to file a request until the functionality is avaialble in the AWS provider
• Yes ✅: please list the AWS provider version which introduced this functionality

Yes, support for gp3 storage type and storage_throughput attribute was added to Terraform AWS provider in version 4.45.0: https://github.com/hashicorp/terraform-provider-aws/blob/main/CHANGELOG.md#4450-december--2-2022

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FWIW, I can create a PR myself, but I'd like to understand what's the general strategy when adding new attributes? Do you increase Terraform AWS version provider requirement? Do you bump minor version? Or major?

[antonbabenko]

This issue has been resolved in version 5.2.0 🎉

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