Update dependency org.junit.jupiter:junit-jupiter to v6

Author: renovate[bot]

gradle.properties

@@ -30,7 +30,7 @@ VER_SLF4J=[1.6,2.0[
 # Used in multiple places
 VER_DURIAN=1.2.0
 VER_JGIT=7.4.0.202509020913-r
-VER_JUNIT=5.14.0
+VER_JUNIT=6.0.0
 VER_ASSERTJ=3.27.6
 VER_MOCKITO=5.20.0
 VER_SELFIE=2.5.4