Update dependency org.junit:junit-bom to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ hivemq-extensionSdk = "4.7.2"
 hivemq-testcontainer-junit5 = "2.0.0"
 jctools = "2.1.2"
 jetbrains-annotations = "26.0.2-1"
-junit-jupiter = "5.14.0"
+junit-jupiter = "6.0.0"
 mockito = "5.20.0"
 netty = "4.1.127.Final"
 paho = "1.2.5"