Update dependency org.mockito.kotlin:mockito-kotlin to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ lint-gradle = "1.0.0-alpha05"
 log4j = "2.25.3"
 logback = "1.5.23"
 minGradle = "8.12.1"
-mockito = "5.4.0"
+mockito = "6.2.3"
 moshi = "1.15.2"
 picocli = "4.7.7"
 okhttp = "5.3.2"