Update dependencies

Among others, this updates minio-go, so that the new "eu-west-3" zone
for AWS is supported.

vendor/cloud.google.com/go/datastore/save_test.go

@@ -15,9 +15,10 @@
 package datastore
 
 import (
-	"reflect"
 	"testing"
 
+	"cloud.google.com/go/internal/testutil"
+
 	pb "google.golang.org/genproto/googleapis/datastore/v1"
 )
 
@@ -187,7 +188,7 @@ func TestSaveEntityNested(t *testing.T) {
 			continue
 		}
 
-		if !reflect.DeepEqual(tc.want, got) {
+		if !testutil.Equal(tc.want, got) {
 			t.Errorf("%s: compare:\ngot:  %#v\nwant: %#v", tc.desc, got, tc.want)
 		}
 	}