fix: send chat input as dict

[cristipufu]

Description

This PR fixes a bug where chat input messages were being sent as Pydantic model objects instead of dictionaries. The fix serializes the UiPathConversationMessage object using model_dump(by_alias=True) before assigning it to the input_data field, which is then passed to the runtime execution.

Development Package

• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath-dev==0.0.17.dev1000350098",

  # Any version from PR
  "uipath-dev>=0.0.17.dev1000350000,<0.0.17.dev1000360000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath-dev = { index = "testpypi" }