cli: Add ruff rule UP (pyupgrade) (#31843)

See https://docs.astral.sh/ruff/rules/#pyupgrade-up
All auto-fixed

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>

libs/cli/langchain_cli/cli.py

@@ -1,7 +1,6 @@
-from typing import Optional
+from typing import Annotated, Optional
 
 import typer
-from typing_extensions import Annotated
 
 from langchain_cli._version import __version__
 from langchain_cli.namespaces import app as app_namespace