Add support for storage_type = "gp3" for AWS RDS

[YanRah]

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

Is your request related to a problem? Please describe.

Describe the solution you'd like.

Describe alternatives you've considered.

Additional context

[antonbabenko]

Duplicate of #441

[YanRah]

the provider supports the new attribute value but i am getting that when apply.

Error: expected storage_type to be one of [standard gp2 io1], got gp3
│
│ with module.ef-core.module.db.module.db_instance.aws_db_instance.this[0],
│ on .terraform/modules/ef-core.db/modules/db_instance/main.tf line 42, in resource "aws_db_instance" "this":
│ 42: storage_type = var.storage_type

[github-actions]

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