update tests

Author: Yuan325

integration.cloudbuild.yaml

@@ -21,7 +21,6 @@ steps:
   - id: Run integration tests
     name: python:3.11
     entrypoint: python
-    args: ["-m", "pytest"]
     env:
       - 'PROJECT_ID=$PROJECT_ID'
       - 'INSTANCE_ID=${_INSTANCE_ID}'

src/langchain_google_spanner/document_loader.py

@@ -14,7 +14,7 @@
 
 import datetime
 import json
-from typing import Iterator, List, Optional, Dict, Any
+from typing import Any, Dict, Iterator, List, Optional
 
 from google.cloud.spanner import Client, KeySet
 from google.cloud.spanner_admin_database_v1.types import DatabaseDialect  # type: ignore