chore(deps): update dependency org.mockito:mockito-core to v5.15.2

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotest = "5.9.1"
 kotlin = "2.1.0"
-mockito = "5.14.2"
+mockito = "5.15.2"
 
 [libraries]
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }