chore(aiplatform): Change CreateBatchPredictionGeminiJobSample to use gemini 2.5 (#10230)

Author: amcolin

aiplatform/src/main/java/aiplatform/batchpredict/CreateBatchPredictionGeminiJobSample.java

@@ -72,7 +72,7 @@ public static BatchPredictionJob createBatchPredictionGeminiJobSample(
       String modelName =
           String.format(
               "projects/%s/locations/%s/publishers/google/models/%s",
-              project, location, "gemini-2.0-flash-001");
+              project, location, "gemini-2.5-flash");
 
       BatchPredictionJob batchPredictionJob =
           BatchPredictionJob.newBuilder()