Bump itextpdf from 5.5.9 to 5.5.12
Bump itextpdf from 5.5.9 to 5.5.12

Bumps [itextpdf](https://github.com/itext/itextpdf) from 5.5.9 to 5.5.12.
- [Release notes](https://github.com/itext/itextpdf/releases)
- [Commits](https://github.com/itext/itextpdf/compare/5.5.9...5.5.12)

---
updated-dependencies:
- dependency-name: com.itextpdf:itextpdf
  dependency-type: direct:production
...

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