chore(genai): Update live_audiogen_with_txt to gemini-2.5-flash-native-audio (#13791)

* chore(genai): Update live_audiogen_with_txt to gemini-2.5-flash-native-audio

* chore(genai) Update gimini to live-2.5

Author: angelcaamal

genai/live/live_audiogen_with_txt.py

@@ -29,7 +29,7 @@ async def generate_content() -> None:
                                     VoiceConfig)
 
     client = genai.Client()
-    model = "gemini-2.0-flash-live-preview-04-09"
+    model = "gemini-live-2.5-flash-native-audio"
     # For more Voice options, check https://cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/2-5-flash#live-api-native-audio
     voice_name = "Aoede"