fix(deps): update dependency unstructured to v0.16.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
unstructured	==0.16.17 -> ==0.16.19

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Release Notes

Unstructured-IO/unstructured (unstructured)

v0.16.19

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Enhancements

Features

Fixes

• Fix a bug where table extraction is skipped when it shouldn't. Pages with just one table as its content or starts with a table misses table extraction. The routing logic is now fixed.
• Correct deprecated ruff invocation in make tidy. This will future-proof it or avoid surprises if someone happens to upgrade Ruff.
• Remove upper bound constraint on python version in setup.py. Python3.13 is not yet officially supported, but allow users to try.
• Fixes removing HTML elements from the inside of table cells in html partition v=2.0. The HTML partitioner now correctly preserves HTML elements from the inside of table cells.

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