refactor: replace deprecated Iterator with Generator in contextmanagers #35433 (#35441)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/app/file_access/scope.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from collections.abc import Iterator
+from collections.abc import Generator  # Changed from Iterator
 from contextlib import contextmanager
 from contextvars import ContextVar
 from dataclasses import dataclass
@@ -32,7 +32,7 @@ def get_current_file_access_scope() -> FileAccessScope | None:
 
 
 @contextmanager
-def bind_file_access_scope(scope: FileAccessScope) -> Iterator[None]:
+def bind_file_access_scope(scope: FileAccessScope) -> Generator[None, None, None]:  # Changed from Iterator[None]
     token = _current_file_access_scope.set(scope)
     try:
         yield

api/libs/flask_utils.py

@@ -1,5 +1,5 @@
 import contextvars
-from collections.abc import Iterator
+from collections.abc import Generator  # Changed from Iterator
 from contextlib import contextmanager
 from typing import TYPE_CHECKING
 
@@ -13,7 +13,7 @@ if TYPE_CHECKING:
 def preserve_flask_contexts(
     flask_app: Flask,
     context_vars: contextvars.Context,
-) -> Iterator[None]:
+) -> Generator[None, None, None]:  # Changed from Iterator[None]
     """
     A context manager that handles:
     1. flask-login's UserProxy copy

api/providers/vdb/vdb-analyticdb/src/dify_vdb_analyticdb/analyticdb_vector_sql.py

@@ -1,6 +1,6 @@
 import json
 import uuid
-from collections.abc import Iterator
+from collections.abc import Generator  # Added Generator
 from contextlib import contextmanager
 from typing import Any
 
@@ -75,7 +75,7 @@ class AnalyticdbVectorBySql:
         )
 
     @contextmanager
-    def _get_cursor(self) -> Iterator[Any]:
+    def _get_cursor(self) -> Generator[Any, None, None]:  # Changed from Iterator[Any]
         assert self.pool is not None, "Connection pool is not initialized"
         conn = self.pool.getconn()
         cur = conn.cursor()

api/services/file_service.py

@@ -2,7 +2,7 @@ import base64
 import hashlib
 import os
 import uuid
-from collections.abc import Iterator, Sequence
+from collections.abc import Generator, Sequence  # Changed Iterator to Generator
 from contextlib import contextmanager, suppress
 from tempfile import NamedTemporaryFile
 from typing import Literal
@@ -324,7 +324,7 @@ class FileService:
     def build_upload_files_zip_tempfile(
         *,
         upload_files: Sequence[UploadFile],
-    ) -> Iterator[str]:
+    ) -> Generator[str, None, None]:  # Changed from Iterator[str]
         """
         Build a ZIP from `UploadFile`s and yield a tempfile path.