Update minio sdk version

Description

Update the minio-go SDK as we are still running an old version v3 and the lest version is 6.

Problems it solves

• As you can see in this failing pipeline github.com/minio/go-homedir was deleted. This was changed to another libabrary which was introduced in v4. This is not a critical issue as we have all the dependencies vendored but this might start failing if someone uses dep.
• Add support for new regions, as listed here, since right now we only support the following regions

Proposal

Upgrade to the lest version of SDK.