chore: bump org.junit.platform:junit-platform-launcher (#385)

Bump junit-platform-launcher 1.11.4 → 6.1.0 to match JUnit Jupiter 6.1.0 (aligned versioning in JUnit 6).

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ androidxTestEspresso = "3.7.0"
 coroutines = "1.11.0"
 junit = "4.13.2"
 junit5 = "5.11.4"
-junitPlatform = "1.11.4"
+junitPlatform = "6.1.0"
 kotlin = "2.4.0"
 # standalone per KSP 2.0+ guidance — NOT kotlinVersion-kspVersion; easy
 # to miss during Kotlin upgrades since it no longer tracks the Kotlin version.