Update dependency unstructured to v0.18.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
unstructured	==0.17.2 -> ==0.18.9

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Release Notes

Unstructured-IO/unstructured (unstructured)

v0.18.9

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Enhancements

Features

• Convert elements to markdown for output Added function to convert elements to markdown format for easy viewing.

Fixes

• Language detection nit* Handle empty text

v0.18.7

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Enhancements

• text_as_html for Table element now keeps both input and img tag's class attribute Previously in partition HTML any tag inside a table is stripped of its class attribute. Now this attribute is preserved for both input and img tag in the table element's metadata.text_as_html.

Features

• Add language detection for PDFs Add document and element level language detection to PDFs.

Fixes

v0.18.6

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Enhancements

Features

Fixes

• Improved epub partition errors EPUB partition will now produce new type of error on unprocessable files.
• Fix type for serialized TableChunks Use TableChunk for the string value of the field type when serializing elements of type TableChunk, rather than using the value Table.

v0.18.5

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Enhancements

• Bump dependencies and remove lingering Python 3.9 artifacts Cleaned up some references to 3.9 that were left When we dropped Python 3.9 support.
• text_as_html for Table element now keeps img tag's class attribute Previously in partition HTML any tag inside a table is stripped of its class attribute. Now this attribute is preserved for img tag in the table element's metadata.text_as_html.

Features

Fixes

• Improve markdown code block handling Code blocks in markdown were previously being processed as embedded code instead of plain text.

v0.18.3

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Enhancements

Features

Fixes

• Upgrade Pillow to 11.3.0 Addresses a high priority CVE

v0.18.2

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Enhancements

Features

Fixes

• Fixes empty HTML content Previously, when the HTML content was empty, the partitioner would raise a TypeError: Invalid input object: NoneType. Now it will return an empty list of elements.
• Failproof docx malformed or merged tables This fix prevents docx file with complex or vertical merges or malformed tables from failing at tc_at_grid_offset and raised ValueError: no tc element at grid_offset=X.
• partition_md can read special characters on non- utf-8 files partition_md reads the file as utf-8 previously. Now it uses read_txt_file that reads file with detected encoding.
• xml code not getting escaped in a code block in a markdown file when in partition
• Fixes parsing HTML header and footer Previously header and footer texts are partitioned as UncategorizedText or as the nested structure like Title. Now they are properly partitioned as Header and Footer element types.

v0.18.1

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Enhancements

Features

• Add DocumentData element type This is helpful in scenarios where there is large data that does not make sense to represent across each element in the document.

Fixes

• The encoding property of the _CsvPartitioningContext is now properly used.

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