[Bug] Breaking httpx version

[sbartlett97]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

Update version pin for httpx library which is breaking OpenAI api usage

Additional context & links

File "/usr/src/app/agent_executor.py", line 15, in initialise_agent_executor
     llm = ChatOpenAI(
           ^^^^^^^^^^^
   File "/usr/local/lib/python3.12/site-packages/langchain_core/load/serializable.py", line 125, in __init__
     super().__init__(*args, **kwargs)
   File "/usr/local/lib/python3.12/site-packages/pydantic/main.py", line 193, in __init__
     self.__pydantic_validator__.validate_python(data, self_instance=self)
   File "/usr/local/lib/python3.12/site-packages/langchain_openai/chat_models/base.py", line 551, in validate_environment
     self.root_client = openai.OpenAI(**client_params, **sync_specific)  # type: ignore[arg-type]
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/local/lib/python3.12/site-packages/openai/_client.py", line 123, in __init__
     super().__init__(
   File "/usr/local/lib/python3.12/site-packages/openai/_base_client.py", line 856, in __init__
     self._client = http_client or SyncHttpxClientWrapper(
                                   ^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/local/lib/python3.12/site-packages/openai/_base_client.py", line 754, in __init__
     super().__init__(**kwargs)

[dgellow]

#1905 should fix the issue