Move to Java 25 for develop

[hmottestad]

We want to move to Java 25 on the develop branch, so that the next major release of RDF4J uses Java 25.

Blockers:

• upgrade spring-boot to a version that supports java 25

[hmottestad]

This requires license verification before releasing 6.0.0.

Status: https://gitlab.eclipse.org/eclipsefdn/emo-team/iplab/-/issues/?sort=created_date&state=opened&author_username=hottestad&first_page_size=20