refac: modernize type annotations (PEP 604 / PEP 585)

backend/open_webui/retrieval/vector/dbs/s3vector.py

@@ -2,17 +2,18 @@
 NOTE: This vector database integration is community-supported and maintained on a best-effort basis.
 """
 
-from open_webui.retrieval.vector.utils import process_metadata
+import logging
+from typing import Any, Dict, List, Optional, Union
+
+import boto3
+from open_webui.config import S3_VECTOR_BUCKET_NAME, S3_VECTOR_REGION
 from open_webui.retrieval.vector.main import (
-    VectorDBBase,
-    VectorItem,
     GetResult,
     SearchResult,
+    VectorDBBase,
+    VectorItem,
 )
-from open_webui.config import S3_VECTOR_BUCKET_NAME, S3_VECTOR_REGION
-from typing import List, Optional, Dict, Any, Union
-import logging
-import boto3
+from open_webui.retrieval.vector.utils import process_metadata
 
 log = logging.getLogger(__name__)