Update org.junit.jupiter to v5.12.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 kotlin = "2.1.10"
-junit = "5.11.4"
+junit = "5.12.0"
 
 [libraries]
 jdbc-h2 = { module = "com.h2database:h2", version = "2.3.232" }