[REQ] Update Go client generator to us AWS SDK v2

The AWS Go SDK V1 will reach end-of-support on July 31, 2025: https://aws.amazon.com/blogs/developer/announcing-end-of-support-for-aws-sdk-for-go-v1-on-july-31-2025/

## Describe the solution you'd like
The Go client should be updated to use the new versions for using the V4 signature:
- github.com/aws/aws-sdk-go-v2/credentials
- github.com/aws/aws-sdk-go-v2/aws/signer/v4