misc/py-haystack_ai: Update to 2.18.1HEADmain

- Enhancement Notes:
  - Added tools to agent run parameters to enhance the agent's
    flexibility. Users can now choose a subset of tools for the agent at
    runtime by providing a list of tool names, or supply an entirely new
    set by passing Tool objects or a Toolset.

- Bug Fixes
  - Fix Agent run_async method to correctly handle async streaming
    callbacks. This previously triggered errors due to a bug.
  - Prevent duplication of the last assistant message in the chat
    history when initializing from an AgentSnapshot.
  - We were setting response_format to None in OpenAIChatGenerator by
    default which doesn't follow the API spec. We now omit the variable
    if response_format is not passed by the user.

Sponsored by:	resulta.tech

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