Bumps [maven-pdf-plugin](https://github.com/apache/maven-pdf-plugin) from 1.2 to 1.5.1.
- [Release notes](https://github.com/apache/maven-pdf-plugin/releases)
- [Commits](https://github.com/apache/maven-pdf-plugin/compare/maven-pdf-plugin-1.2...maven-pdf-plugin-1.5.1

)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-pdf-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
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