fix: explicitly type Unit parameter in listeners lambda

Author: mfazekas

android/src/main/java/com/margelo/nitro/rive/HybridViewModelListProperty.kt

@@ -57,7 +57,7 @@ class HybridViewModelListProperty(private val listProperty: ViewModelListPropert
   }
 
   override fun addListener(onChanged: () -> Unit) {
-    listeners.add { onChanged() }
+    listeners.add { _: Unit -> onChanged() }
     ensureValueListenerJob(listProperty.valueFlow.map { })
   }
 }