Update asciidoctor-pdf requirement from 2.3.24 to 2.3.27

[dependabot]

Updates the requirements on asciidoctor-pdf to permit the latest version.

Changelog

Sourced from asciidoctor-pdf's changelog.

== 2.3.27 (2026-09-02) - @​mojavelinux

Bug Fixes::

• honor attribute unset in AsciiDoc table cell when determining if attribute is unspecified

=== Details

{url-repo}/releases/tag/v2.3.27[git tag] | {url-repo}/compare/v2.3.26...v2.3.27[full diff]

== 2.3.26 (2026-09-02) - @​mojavelinux

Bug Fixes::

• scope Document#attr_unspecified? to parent document; don't crash if :attributes option not set (#2656)

=== Details

{url-repo}/releases/tag/v2.3.26[git tag] | {url-repo}/compare/v2.3.25...v2.3.26[full diff]

== 2.3.25 (2026-08-31) - @​mojavelinux

Enhancements::

• add the ballot X glyphs (U+2717 and U+2718) to the code and fallback fonts (#2652)

Improvements::

• suppress warning if glyph for LF cannot be found in fallback font as it's unlike to impact rendering

Bug Fixes::

• properly encode all non-ASCII IDs when creating and referencing destinations in PDF (#2646) (@​sandraLbdvTW)
• don't crash when creating toc for article with only an abstract section (#2649)
• use empty value for preface in running content if preface-title attribute is explicitly unset (#2644)
• don't allow admonition-label-min-width key to be less than required space to fit admonition icon
• correctly map all icons from FontAwesome 4 (#2373)
• don't include children of section with empty title in TOC
• don't include children of section with empty title in outline
• when checking whether an attribute is unspecified, consider attributes that are soft set/unset from API/CLI (#2654)
• restore original require after loading treetop

=== Details

{url-repo}/releases/tag/v2.3.25[git tag] | {url-repo}/compare/v2.3.24...v2.3.25[full diff]

== 2.3.24 (2025-11-15) - @​mojavelinux

Improvements::

... (truncated)

Commits

• 39a9755 release 2.3.27
• 939877a honor attribute unset in AsciiDoc table cell when determining if attribute is...
• aa6af72 prepare branch for development [no ci]
• dc581c3 release 2.3.26
• 88b2c35 backport fix for #2656 scope Document#attr_unspecified? to parent document
• 4b80faf prepare branch for development [no ci]
• dd6dde5 release 2.3.25
• 9bd22d5 fix code lint error
• 93eb6c6 restore original require after loading treetop
• daf849c backport fix for #2373 correctly map all icons from FontAwesome 4
• Additional commits viewable in compare view

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