bug/pypi-incomplete source on PyPI for unstructured (tested 0.5.x)

[petrklus]

Describe the bug
The package build fails with the following message:

FileNotFoundError: [Errno 2] No such file or directory: 'requirements/ingest/clarifai.in'

To Reproduce

Running the pip install of the package reproduces the error above, if the package needs to be built from the package source. Built distributions not tested.

Additional context

While the file in question is present here on github https://github.com/Unstructured-IO/unstructured/releases/tag/0.15.13, it does not seem to be present on PyPI, the link below is indeed missing the file:

https://files.pythonhosted.org/packages/46/40/d88c658898474e40a4b262abd953040c13f1fc684b863458ed069c40254a/unstructured-0.15.13.tar.gz

Reviewed source packages for 0.5.x versions, all seems to be missing the file requirements/ingest/clarifai.in. Older versions were not tested.