Update asciidoctor-pdf requirement from 2.3.17 to 2.3.18 (#58)
Updates the requirements on [asciidoctor-pdf](https://github.com/asciidoctor/asciidoctor-pdf) to permit the latest version.
- [Release notes](https://github.com/asciidoctor/asciidoctor-pdf/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-pdf/blob/main/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctor-pdf/compare/v2.3.17...v2.3.18)
---
updated-dependencies:
- dependency-name: asciidoctor-pdf
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
