Description of the new Feature/Bugfix

I've clean up mockito setup in pom. Changes:

• Remove unused mockito4.version from main POM (looks like this is some kind of leftover)
• Use one version of Mockito (main project had 5.9, OpenPDF had 5.10, this override was needed because mockito 5 was used in profile. This has no greater sense since in main pom dependencies are in dependencyManagement not like direct usage)
• Upgrade Mockito (5.10.0 -> 5.17.0) (no changes needed)

Unit-Tests for the new Feature/Bugfix

This depencency is only for testing. All tests passes.

Your real name

Hello, my name is Emil Sierżęga.