Update api.txt

Author: daymxn

firebase-ai/api.txt

@@ -352,6 +352,7 @@ package com.google.firebase.ai.type {
     field public Integer? maxOutputTokens;
     field public Float? presencePenalty;
     field public String? responseMimeType;
+    field public java.util.List<com.google.firebase.ai.type.ResponseModality>? responseModalities;
     field public com.google.firebase.ai.type.Schema? responseSchema;
     field public java.util.List<java.lang.String>? stopSequences;
     field public Float? temperature;