Update live model version (#145)

Author: lethargicpanda

samples/gemini-live-todo/README.md

@@ -18,7 +18,7 @@ Here is the key snippet of code that initializes the model and connects to a liv
 
 ```kotlin
 val generativeModel = Firebase.ai(backend = GenerativeBackend.vertexAI()).liveModel(
-    "gemini-2.0-flash-live-preview-04-09",
+    "gemini-2.5-flash-native-audio-preview-12-2025",
     generationConfig = liveGenerationConfig,
     systemInstruction = systemInstruction,
     tools = listOf(

samples/gemini-live-todo/src/main/java/com/android/ai/samples/geminilivetodo/ui/TodoScreenViewModel.kt

@@ -161,7 +161,7 @@ class TodoScreenViewModel @Inject constructor(private val todoRepository: TodoRe
 
             // See https://firebase.google.com/docs/ai-logic/live-api for an overview of available models
             val generativeModel = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
-                "gemini-2.5-flash-native-audio-preview-09-2025",
+                "gemini-2.5-flash-native-audio-preview-12-2025",
                 generationConfig = liveGenerationConfig,
                 systemInstruction = systemInstruction,
                 tools = listOf(