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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 gradle-starter = "0.91.0"
 gradle-gradleup-shadow = "9.2.2"
 mavencentral-kotlin = "2.2.20"
-mavencentral-junit = "5.14.0"
+mavencentral-junit = "6.0.0"
 mavencentral-assertj = "3.27.6"
 mavencentral-coroutines = "1.10.2"
 mavencentral-okhttp = "5.1.0"