Upgrade AWS SDK for Go v1 to v2

Hello!

Per [AWS](https://aws.amazon.com/blogs/developer/announcing-end-of-support-for-aws-sdk-for-go-v1-on-july-31-2025/), aws-sdk-go v1 is currently in maintenance mode and will go end-of-support on July 25th, 2025.

We use go-getter in Nomad, and are updating to the v2 AWS client, causing Nomad to pull in both versions as dependencies. It would be great to get this updated. Thanks!