chore: update python-docx version dependency (#2952)
**Summary**
`unstructured` will use table features added in the most recent version
of `python-docx`.
Also update the `lxml` version constraint because `lxml>4.9.2` will not
install on Apple Silicon
(https://github.com/Unstructured-IO/unstructured/issues/1707).
`python-docx` requires `lxml` although other file formats require it as
well.
