fix(deps): update junit-framework monorepo to v6

Author: renovate[bot]

gradle/libraries.versions.toml

@@ -3,8 +3,8 @@ retrofit2 = "3.0.0"
 jjwt = "0.13.0"
 jackson = "2.20.0"
 assertj = "3.27.6"
-junit = "5.14.0"
-junitPlatformLauncher = "1.14.0"
+junit = "6.0.0"
+junitPlatformLauncher = "6.0.0"
 slf4j = "2.0.17"
 mockito = "5.20.0"
 okhttp3 = "5.1.0"