refactor(cli): target ruff 310 (#32985)

Use union types for optional parameters

libs/cli/langchain_cli/namespaces/integration.py

@@ -5,7 +5,7 @@ import re
 import shutil
 import subprocess
 from pathlib import Path
-from typing import Annotated, Optional, cast
+from typing import Annotated, cast
 
 import typer
 from typing_extensions import TypedDict
@@ -66,14 +66,14 @@ def new(
         ),
     ],
     name_class: Annotated[
-        Optional[str],
+        str | None,
         typer.Option(
             help="The name of the integration in PascalCase. e.g. `MyIntegration`."
             " This is used to name classes like `MyIntegrationVectorStore`",
         ),
     ] = None,
     src: Annotated[
-        Optional[list[str]],
+        list[str] | None,
         typer.Option(
             help="The name of the single template file to copy."
             " e.g. `--src integration_template/chat_models.py "
@@ -81,7 +81,7 @@ def new(
         ),
     ] = None,
     dst: Annotated[
-        Optional[list[str]],
+        list[str] | None,
         typer.Option(
             help="The relative path to the integration package to place the new file in"
             ". e.g. `my-integration/my_integration.py`",
@@ -220,7 +220,7 @@ def create_doc(
         ),
     ],
     name_class: Annotated[
-        Optional[str],
+        str | None,
         typer.Option(
             help=(
                 "The PascalCase name of the integration (e.g. `OpenAI`, "