Since upgrade to minio-go 4.0 remove workaround
Since upgrade to minio-go 4.0 remove workaround

We added previously a code to fix the issue of chaining
credentials, we do not need this anymore since the
upstream minio-go already has this relevant change.

kurin/restic,ar-jan/restic,middelink/restic,restic/restic,restic/restic,ar-jan/restic,kurin/restic,middelink/restic