AWS SDK version is out of date

Currently, we're using aws-sdk-go v1.36.21 (go.mod entry):

github.com/aws/aws-sdk-go v1.36.21

This version is from 2021: https://github.com/aws/aws-sdk-go/commit/f259b6fac27528dd491fad0bc9621a0e5f77b900

aws-sdk-go v1 is currently in maintenance mode, and will be ending support on July 31st, 2025. I'm assuming that upgrading to v2 might be out of scope for how we maintain this fork, but we should probably bump to a much newer (or even the latest) version of the v1 SDK in order to ensure we have the latest security fixes.

This was brought to my attention in a GitLab Premium customer ticket.