remove OSS gateway due to lack of licensing (#9390)

OSS go sdk lacks licensing terms in their
repository, and there has been no activity

On the issue here https://github.com/aliyun/aliyun-oss-go-sdk/issues/245

This PR is to ensure we remove any dependency code which
lacks explicit license file in their repo.

cmd/api-errors.go

@@ -25,7 +25,6 @@ import (
 	"strings"
 
 	"github.com/Azure/azure-storage-blob-go/azblob"
-	"github.com/aliyun/aliyun-oss-go-sdk/oss"
 	"google.golang.org/api/googleapi"
 
 	minio "github.com/minio/minio-go/v6"
@@ -1917,12 +1916,6 @@ func toAPIError(ctx context.Context, err error) APIError {
 				Description:    e.Error(),
 				HTTPStatusCode: e.Response().StatusCode,
 			}
-		case oss.ServiceError:
-			apiErr = APIError{
-				Code:           e.Code,
-				Description:    e.Message,
-				HTTPStatusCode: e.StatusCode,
-			}
 			// Add more Gateway SDKs here if any in future.
 		}
 	}