Update junit5 monorepo

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,8 +6,8 @@ googleJavaFormat = "1.24.0"
 jmh = "0.7.2"
 jqwik = "1.9.2"
 jspecify = "1.0.0"
-junit = "5.11.4"
-junitLauncher = "1.11.4"
+junit = "5.12.1"
+junitLauncher = "1.12.1"
 kotlin = "2.0.21"
 ktfmt = "0.53"
 messagePack = "0.9.9"