v2.3.1

AWS provider 6 support (aws_eip) @mmh (#79)

## what This PR makes it possible to use the module with the latest version of the AWS provider (version 6)

why

aws_eip no longer supports a vpc argument. It needs to be changed to domain

Causes this error when running terraform

│ Error: Unsupported argument
│ 
│   on .terraform/modules/sftp/main.tf line 105, in resource "aws_eip" "sftp":
│  105:   vpc = local.is_vpc
│ 
│ An argument named "vpc" is not expected here.

references

closes #78

🤖 Automatic Updates

Fix go version in tests @osterman (#76)

## what - Update go `1.24`

why

• Error loading shared library libresolv.so.2 in Go 1.20

References

• https://sweetops.slack.com/archives/G014YEKDH4K/p1746672149263629
• golang/go#59305 (comment)
• cloudposse/terraform-aws-cloudfront-s3-cdn#294

Replace Makefile with atmos.yaml @osterman (#75)

## what - Remove `Makefile` - Add `atmos.yaml`

why

• Replace build-harness with atmos for readme genration

References

• DEV-3229 Migrate from build-harness to atmos