build: modernize with "go fix -rangeint": use range over int

backend/azureblob/arrowlist/arrow.go

@@ -157,7 +157,7 @@ func parseArrowStream(body io.Reader) ([]*container.BlobItem, *string, error) {
 		rec := reader.RecordBatch()
 		rows := int(rec.NumRows())
 
-		for row := 0; row < rows; row++ {
+		for row := range rows {
 			item := &container.BlobItem{
 				Properties: &container.BlobProperties{},
 			}

backend/azureblob/arrowlist/arrow_test.go

@@ -198,7 +198,7 @@ func TestHandleFlatListResponse_MultiRecordBatch(t *testing.T) {
 
 	// First batch: 2 rows
 	builder := arrowArray.NewRecordBuilder(alloc, schema)
-	for i := 0; i < 2; i++ {
+	for range 2 {
 		builder.Field(0).(*arrowArray.StringBuilder).Append("batch1_blob")
 		for j := 1; j < 11; j++ {
 			builder.Field(j).AppendNull()