partners[lint]: run pyupgrade to get code in line with 3.9 standards (#30781)

Using `pyupgrade` to get all `partners` code up to 3.9 standards
(mostly, fixing old `typing` imports).

libs/partners/openai/langchain_openai/embeddings/azure.py

@@ -2,12 +2,13 @@
 
 from __future__ import annotations
 
-from typing import Awaitable, Callable, Optional, Union
+from collections.abc import Awaitable
+from typing import Callable, Optional, Union, cast
 
 import openai
 from langchain_core.utils import from_env, secret_from_env
 from pydantic import Field, SecretStr, model_validator
-from typing_extensions import Self, cast
+from typing_extensions import Self
 
 from langchain_openai.embeddings.base import OpenAIEmbeddings