Model update in VertexAiGeminiChatModelIT from GEMINI_2_5_PRO to GEMINI_2_0_FLASH

Update gemini-2.5-pro-exp-03-25 to gemini-2.5-pro-exp-03-28

Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>

Author: sobychacko

models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatModel.java

@@ -869,7 +869,7 @@ public enum ChatModel implements ChatModelDescription {
 
 		GEMINI_2_0_FLASH_LIGHT("gemini-2.0-flash-lite"),
 
-		GEMINI_2_5_PRO("gemini-2.5-pro-exp-03-25");
+		GEMINI_2_5_PRO("gemini-2.5-pro-exp-03-28");
 
 		public final String value;
 

models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatModelIT.java

@@ -304,7 +304,7 @@ public VertexAiGeminiChatModel vertexAiEmbedding(VertexAI vertexAi) {
 			return VertexAiGeminiChatModel.builder()
 				.vertexAI(vertexAi)
 				.defaultOptions(VertexAiGeminiChatOptions.builder()
-					.model(VertexAiGeminiChatModel.ChatModel.GEMINI_2_5_PRO)
+					.model(VertexAiGeminiChatModel.ChatModel.GEMINI_2_0_FLASH)
 					.build())
 				.build();
 		}