fix basic example on database/sql

Author: asmyasnikov

examples/basic/database_sql/series.go

@@ -9,6 +9,7 @@ import (
 	"path"
 	"time"
 
+	ydb "github.com/ydb-platform/ydb-go-sdk/v3"
 	"github.com/ydb-platform/ydb-go-sdk/v3/retry"
 	"github.com/ydb-platform/ydb-go-sdk/v3/sugar"
 	"github.com/ydb-platform/ydb-go-sdk/v3/table"