fix: mock langchain human message

[cristipufu]

Development Package

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

[project]
dependencies = [
  # Exact version:
  "uipath-dev==0.0.7.dev1000160032",

  # Any version from PR
  "uipath-dev>=0.0.7.dev1000160000,<0.0.7.dev1000170000"
]

[[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" }