Logback: upgrade to 1.5.25+

[barthanssens]

Logback prior to 1.5.25 has a (low severity) issue CVE-2026-1225

Upgrading to 1.5.25 or higher is recommended

[aschwarte10]

PR #5800 is merged and this will become part of RDF4J 6.0 (after M1)

Closing this ticket