Wiki pages that produce <br> tags can't always be exported to PDF

This is very easy to reproduce. Just create a wiki page with this content:

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and then try to export it as PDF. Before XWiki 14.9 the PDF export simply hangs forever. After XWiki 14.9 you get a timeout after 60s (by default). The problem doesn't reproduce if the lines of text (text DOM nodes) are unique (don't repeat).

This is a Paged.js issue, reported:

• here https://github.com/pagedjs/pagedjs/issues/111
• and here https://gitlab.coko.foundation/pagedjs/pagedjs/-/issues/363