Bump org.apache.pdfbox:pdfbox to v3.0.0

[abelsromero]

Kind of change

• [ ] Bug fix
• [x] New non-breaking feature
• [ ] New breaking feature
• [ ] Documentation update
• [x] Build improvement

Description

What is the goal of this pull request?

Upgrade apache pdfbox to latest version.

How does it achieve that?

• Port of https://github.com/asciidoctor/asciidoctorj-pdf/pull/96
• Only affects test utilities

Are there any alternative ways to implement this?

No

Are there any implications of this pull request? Anything a user must know?

No

Issue

If this PR fixes an open issue, please add a line of the form:

Fixes #Issue

Release notes

Please add a corresponding entry to the file CHANGELOG.adoc

It's an internal change, no need to report.

[abelsromero]

Don't merge yet, I forgot to remove some un-necessary config files and I wan to see the rubygems error from CI (macos,19)

[abelsromero]

All fine, a random error :four_leaf_clover:

[robertpanzer]

Thank you!