Standardized openai init params (#21739)

## Patch Summary
community:openai[patch]: standardize init args

## Details
I made changes to the OpenAI Chat API wrapper test in the Langchain
open-source repository

- **File**: `libs/community/tests/unit_tests/chat_models/test_openai.py`
- **Changes**:
  - Updated `max_retries` with Pydantic Field
  - Updated the corresponding unit test
- **Related Issues**: #20085
  - Updated max_retries with Pydantic Field, updated the unit test.

---------

Co-authored-by: JuHyung Son <sonju0427@gmail.com>

libs/community/langchain_community/chat_models/openai.py

@@ -1,4 +1,5 @@
 """OpenAI chat wrapper."""
+
 from __future__ import annotations
 
 import logging
@@ -217,7 +218,7 @@ class ChatOpenAI(BaseChatModel):
     )
     """Timeout for requests to OpenAI completion API. Can be float, httpx.Timeout or 
         None."""
-    max_retries: int = 2
+    max_retries: int = Field(default=2)
     """Maximum number of retries to make when generating."""
     streaming: bool = False
     """Whether to stream the results or not."""