Bump asciidoctorj-pdf from 1.5.0-alpha.15 to 1.5.3
Bump asciidoctorj-pdf from 1.5.0-alpha.15 to 1.5.3

Bumps [asciidoctorj-pdf](https://github.com/asciidoctor/asciidoctorj) from 1.5.0-alpha.15 to 1.5.3.
- [Release notes](https://github.com/asciidoctor/asciidoctorj/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctorj/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctorj/commits/v1.5.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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