ci: align backend lint checks

app/indexing/embeddings.py

@@ -7,8 +7,8 @@ implementation and supports dense + sparse output. We fall back to
 
 from __future__ import annotations
 
+from collections.abc import Sequence
 from functools import lru_cache
-from typing import Sequence
 
 import numpy as np
 

app/indexing/opensearch_client.py

@@ -2,8 +2,9 @@
 
 from __future__ import annotations
 
+from collections.abc import Iterable
 from functools import lru_cache
-from typing import Any, Iterable
+from typing import Any
 
 from opensearchpy import OpenSearch, RequestsHttpConnection
 from opensearchpy.helpers import bulk

app/indexing/qdrant_client.py

@@ -2,8 +2,9 @@
 
 from __future__ import annotations
 
+from collections.abc import Sequence
 from functools import lru_cache
-from typing import Any, Sequence
+from typing import Any
 
 from qdrant_client import QdrantClient
 from qdrant_client.http import models as qm

app/indexing/reranker.py

@@ -7,8 +7,8 @@ Designed to degrade gracefully:
 
 from __future__ import annotations
 
+from collections.abc import Sequence
 from functools import lru_cache
-from typing import Sequence
 
 from app.config import settings
 from app.logging_config import get_logger