style(langchain): drop target-version = py39 (#33288)

Author: mdrxy

libs/langchain/langchain_classic/__init__.py

@@ -2,7 +2,7 @@
 
 import warnings
 from importlib import metadata
-from typing import Any, Optional
+from typing import Any
 
 from langchain_core._api.deprecation import surface_langchain_deprecation_warnings
 
@@ -14,7 +14,7 @@
 del metadata  # optional, avoids polluting the results of dir(__package__)
 
 
-def _warn_on_import(name: str, replacement: Optional[str] = None) -> None:
+def _warn_on_import(name: str, replacement: str | None = None) -> None:
     """Warn on import of deprecated module."""
     from langchain_classic._api.interactive_env import is_interactive_env
 

libs/langchain/langchain_classic/_api/module_import.py

@@ -1,5 +1,6 @@
 import importlib
-from typing import Any, Callable, Optional
+from collections.abc import Callable
+from typing import Any
 
 from langchain_core._api import internal, warn_deprecated
 
@@ -15,9 +16,9 @@
 def create_importer(
     package: str,
     *,
-    module_lookup: Optional[dict[str, str]] = None,
-    deprecated_lookups: Optional[dict[str, str]] = None,
-    fallback_module: Optional[str] = None,
+    module_lookup: dict[str, str] | None = None,
+    deprecated_lookups: dict[str, str] | None = None,
+    fallback_module: str | None = None,
 ) -> Callable[[str], Any]:
     """Create a function that helps retrieve objects from their new locations.