Update junit-framework monorepo to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ gradle-pluginpublish = "2.0.0"
 gradle-doctor = "0.12.1"
 google-agp = "8.13.0"
 google-ksp = "2.2.20-2.0.3"
-maven-junit = "5.14.0"
+maven-junit = "6.0.0"
 maven-assertj = "3.27.6"
 maven-ktlint = "1.7.1"
 maven-commons = "2.20.0"