Support new AWS provider > 6.x and enhanced regional support for resources

[rockholla]

Is your request related to a new offering from AWS?

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

• Yes ✅: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/guides/enhanced-region-support, in provider >= 6.0.0

Is your request related to a problem? Please describe.

No, just trying to get new features enabled

Describe the solution you'd like.

Add region variable to this module to pass through to the underlying aws_ssm_parameter resource definitions.

Describe alternatives you've considered.

N/A

Additional context

PR open for this support already: #12

[rockholla]

Hi all 👋 just curious if we have a temp check/idea of when this might be an acceptable thing to move on for a next version of this module. Thanks! Happy to continue to help in whatever way.