fix: reset offset to zero after seek(milvus-io#2292)

Signed-off-by: MrPresent-Han <chun.han@gmail.com>

pymilvus/orm/iterator.py

@@ -118,6 +118,7 @@ def __seek_to_offset(self):
                 **seek_params,
             )
             self.__update_cursor(res)
+            self._kwargs[OFFSET] = 0
 
     def __init_cp_file_handler(self) -> bool:
         mode = "w"