build(deps): update xhtml2pdf requirement from >=0.2.21 to >=0.2.23 - #540

Sourced from xhtml2pdf's releases.

v.0.2.23

This release adds CSS custom properties, real block boxes and long-word wrapping. It also fixes a round of table, table-of-contents and chart bugs, and renders long documents with far less memory and time. The PDF output of the speed and memory work is byte-for-byte identical to 0.2.22.

🎉 New

• CSS custom properties: --name: value and var(--name, fallback) work anywhere a value goes, including shorthands, @page, @frame and @font-face (#743).
• A block's box goes round everything it holds: a <div> with padding, a border or a background draws one box around its text, tables and inner blocks, and the box is cut cleanly at a page break. The border is no longer copied onto every paragraph and
• Long words wrap: overflow-wrap: break-word / anywhere (and word-wrap) break a wors a URL or a hash, andthis works on links. word-break: break-all is supported (#339). - Table sizing: marmargin: 0 autoapply to tables, and a CSSwidthon ais read ([#386](https://github.com/xhtml2pdf/xhtml2pdf/issues/386)). A table with anauto` margin shrinks toon a table is honoured(#562).
• **Links to other filesd other relative linksbecome real links (#660).
• Block height: a bld, and an empty blockwith a border or background is drawn.
• Charts: they read an entry per series viaseriesNames / seriesColors.

💪🏼 Improvements

• Less memory, and faster. Peak memory for long documents drops to about 40% of what it was: 10,0tead of 371 MB, and a256-row table 14 MB instead of 26 MB. Rendering is 10–39% faster: each word is measured once, a paragrar width, and the parsedHTML is released before layout.
• CSS warnings name the file, a <style> blockor a style attribute (#780).
• Headings inside table s appear in <pdf:toc>.
• Images Pillow refuses for their size are reported the same way max_image_pixels repor

🐛 Bug fixes

• A `<link rel="stylesheropped.
• Named @page rules gave the first page the wrong size, and a leading <pdf:nexttemplate> cous template (#455).
• Right-to-left tables of contents drew their page numbers over the titles, and long entries shrank #664).
• Cell padding was applied twice, and a table margin indented the text inside its cells (#386).
• Translucent backgrounds (#rrggbbaa) were painted twice behind each line of text.
• Chart options barWidth, barSpacing, fontName and strokeColor crashed or were ignored.
• List markers fall back to a font that has their characters. ZapfDingbats and Symbol glyphs are no lon
• page-break-inside: avoid on a single paragraph did nothing, and a heading could be left alone at t
• A truncated or corrupt image no longer aborts the conversion.
• The height attribute

📘 Documentation

• The Django `link_callb Django (#548).
• New docs on overflow-wrap, word-break, -pdf-word-wrap (#532), links, custom properties, posit
• tools/perf now measures memory, leaks and large documents.

Full notes: https://xhtml2pdf.readthedocs.io/en/latest/release-notes.html

• f28aec3 Release 0.2.23
• d3195b5 Release notes for the memory and speed work
• c4c835d Write up the second round of measuring in tools/perf
• be12b46 Look up a fragment's glyph coverage per set, not per character
• 9c7f8fe Deep-copy static frame stories without copy's general machinery too
• 889bc63 Break a paragraph's lines once per width
• b64fb7c Deep-copy a frame without copy's general machinery
• 43efc8c Measure each word once per render, and compare shared frag values by identity
• 9f98d30 Hold in a frag only what its element changed, and let go of the DOM
• cb59fac Measure memory, leaks and big documents in tools/perf
• Additional commits viewable in compare view

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