Update requirements.txt with needed lxml_html_clean

[weirdal3333]

This is a required library.

Summary by Sourcery

Build:

• Add lxml_html_clean to requirements.txt.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds the lxml_html_clean library to the project's requirements.txt file.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added lxml_html_clean to requirements.txt.	Added lxml_html_clean dependency	requirements.txt

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