[CHORE]: remove redundant-cast (#24807)

api/core/rag/datasource/vdb/qdrant/qdrant_vector.py

@@ -3,7 +3,7 @@ import os
 import uuid
 from collections.abc import Generator, Iterable, Sequence
 from itertools import islice
-from typing import TYPE_CHECKING, Any, Optional, Union, cast
+from typing import TYPE_CHECKING, Any, Optional, Union
 
 import qdrant_client
 from flask import current_app
@@ -426,7 +426,6 @@ class QdrantVector(BaseVector):
 
     def _reload_if_needed(self):
         if isinstance(self._client, QdrantLocal):
-            self._client = cast(QdrantLocal, self._client)
             self._client._load()
 
     @classmethod