fix(extension): fix duplicate import

Signed-off-by: Jiyong Huang <huangjy@emqx.io>

extensions/sinks/tdengine/tdengine.go

@@ -18,7 +18,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"fmt"
-	"github.com/lf-edge/ekuiper/internal/topo/transform"
+
 	"reflect"
 	"strings"