Bump Asciidoctor-PDF version to 2.3.10

[asciidoctor-updateclibot]

Bump Asciidoctor-PDF version

Update the key ASCIIDOCTOR_PDF_VERSION in the README.adoc file

1 file(s) updated with ":ASCIIDOCTOR_PDF_VERSION: 2.3.10": * README.adoc

2.3.10

Release published on the 2023-12-04 21:51:33 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-pdf/releases/tag/v2.3.10

This is a patch release in the 2.3.x release line that fixes a few bugs that have been lingering or discovered since the 2.0.0 release.

The highlight of this release is that an image taller than the page that's the first child of a block that itself starts at the top of the page no longer causes an empty page to be inserted. Instead, the image is resized to fit the current page. If `toclevels` is increased for a given section, the dot leaders will now appear in the TOC for those levels. For those using the built-in (AFM) fonts in PDF, a visible fallback character will now be used as a placeholder when a glyph is missing. And when analyzing glyphs for fallback font support in a TTF font, inherited styles are taken into account. Finally, tests have been decoupled from PWD to simplify packaging.

## Distribution

- [RubyGem (asciidoctor-pdf)](https://rubygems.org/gems/asciidoctor-pdf)

## Changelog

### Bug Fixes

* show dot leaders in TOC entry if toclevels is increased for a given section (#2441)
* decouple tests from path of PWD (#2444)
* consider inherited styles when analyzing glyphs for fallback font support (#2463)
* add fallback character for placeholder character when using AFM font (#2453)
* don't advance image that's first child of block at top of page if image is taller than page (#2012)

## Release meta

Released on: 2023-12-04
Released by: @mojavelinux
Release beer: Westbound Select by Westbound & Down

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-pdf/issues?q=is%3Aissue+label%3Av2.3.10+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor-pdf/compare/v2.3.9...v2.3.10) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.3.9/v2.3.10)

## Credits

A very special thanks to all the **awesome** [supporters of the Asciidoctor OpenCollective campaign](https://opencollective.com/asciidoctor), who provide critical funding for the ongoing development of this project.

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