Bump Asciidoctor-PDF version to 2.3.8

[asciidoctor-updateclibot[bot]]

Bump Asciidoctor-PDF version

Update the value of ARG asciidoctor_pdf_version in the Dockerfile

changed lines [16] of file "/tmp/updatecli/github/asciidoctor/docker-asciidoctor/Dockerfile"

2.3.8

Release published on the 2023-06-25 02:17:47 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-pdf/releases/tag/v2.3.8

This is a patch release in the 2.3.x release line that fixes a compatibility issue with Ruby 3.2 when using the optimizer, fixes invisible text in the outline in some PDF readers when the heading contains an index term, and fixes the size of inline images in normal table cells when using certain custom fonts.

## Distribution

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

## Changelog

### Improvements

* do not attempt to fit inline image in normal table cell to computed height of cell (#2428)
* support `fit=none` attribute on inline image to prevent image from being scaled down to fit available height (#2428)

### Bug Fixes

* remove null character enclosed in XML tag when sanitizing text; fixes invisible text in outline when heading contains index term (#2430)
* alias `File.exists?` to `File.exist?` when loading RGhost optimizer to patch incompatibility when using Ruby 3.2

### Build / Infrastructure

* bump upper Ruby version from 3.1 to 3.2 in CI workflow

## Release meta

Released on: 2023-06-24
Released by: @mojavelinux
Release beer: Lost by New Terrain Brewing Company

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-pdf/issues?q=is%3Aissue+label%3Av2.3.8+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor-pdf/compare/v2.3.7...v2.3.8) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.3.7/v2.3.8)

## 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.

Update the key ASCIIDOCTOR_PDF_VERSION in the test harness

Updated to content "ASCIIDOCTOR_PDF_VERSION=2.3.8" in file "tests/asciidoctor.bats"

2.3.8

Release published on the 2023-06-25 02:17:47 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-pdf/releases/tag/v2.3.8

This is a patch release in the 2.3.x release line that fixes a compatibility issue with Ruby 3.2 when using the optimizer, fixes invisible text in the outline in some PDF readers when the heading contains an index term, and fixes the size of inline images in normal table cells when using certain custom fonts.

## Distribution

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

## Changelog

### Improvements

* do not attempt to fit inline image in normal table cell to computed height of cell (#2428)
* support `fit=none` attribute on inline image to prevent image from being scaled down to fit available height (#2428)

### Bug Fixes

* remove null character enclosed in XML tag when sanitizing text; fixes invisible text in outline when heading contains index term (#2430)
* alias `File.exists?` to `File.exist?` when loading RGhost optimizer to patch incompatibility when using Ruby 3.2

### Build / Infrastructure

* bump upper Ruby version from 3.1 to 3.2 in CI workflow

## Release meta

Released on: 2023-06-24
Released by: @mojavelinux
Release beer: Lost by New Terrain Brewing Company

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-pdf/issues?q=is%3Aissue+label%3Av2.3.8+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor-pdf/compare/v2.3.7...v2.3.8) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.3.7/v2.3.8)

## 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.

Update the key ASCIIDOCTOR_PDF_VERSION in the README.adoc file

Updated to content ":ASCIIDOCTOR_PDF_VERSION: 2.3.8" in file "README.adoc"

2.3.8

Release published on the 2023-06-25 02:17:47 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-pdf/releases/tag/v2.3.8

This is a patch release in the 2.3.x release line that fixes a compatibility issue with Ruby 3.2 when using the optimizer, fixes invisible text in the outline in some PDF readers when the heading contains an index term, and fixes the size of inline images in normal table cells when using certain custom fonts.

## Distribution

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

## Changelog

### Improvements

* do not attempt to fit inline image in normal table cell to computed height of cell (#2428)
* support `fit=none` attribute on inline image to prevent image from being scaled down to fit available height (#2428)

### Bug Fixes

* remove null character enclosed in XML tag when sanitizing text; fixes invisible text in outline when heading contains index term (#2430)
* alias `File.exists?` to `File.exist?` when loading RGhost optimizer to patch incompatibility when using Ruby 3.2

### Build / Infrastructure

* bump upper Ruby version from 3.1 to 3.2 in CI workflow

## Release meta

Released on: 2023-06-24
Released by: @mojavelinux
Release beer: Lost by New Terrain Brewing Company

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-pdf/issues?q=is%3Aissue+label%3Av2.3.8+is%3Aclosed) | [source diff](https://github.com/asciidoctor/asciidoctor-pdf/compare/v2.3.7...v2.3.8) | [gem diff](https://my.diffend.io/gems/asciidoctor/v2.3.7/v2.3.8)

## 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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