Update dependency org.asciidoctor:asciidoctorj-pdf to v2.3.18

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.asciidoctor:asciidoctorj-pdf	2.3.17 -> 2.3.18

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Release Notes

asciidoctor/asciidoctorj-pdf (org.asciidoctor:asciidoctorj-pdf)

v2.3.18

What's Changed

• Fix jruby-gradle-plugin & asciidoctor-pdf 2.3.18 by @​robertpanzer in https://github.com/asciidoctor/asciidoctorj-pdf/pull/106

Full Changelog: https://github.com/asciidoctor/asciidoctorj-pdf/compare/v2.3.17...v2.3.18

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