Update GoogleGeminiGenerateContent to use model gemini_2_5_pro_exp_03_25

Author: peterbanda

openai-examples/src/main/scala/io/cequence/openaiscala/examples/googlegemini/GoogleGeminiGenerateContent.scala

@@ -29,7 +29,7 @@ object GoogleGeminiGenerateContent extends ExampleBase[GeminiService] {
       .generateContent(
         contents,
         settings = GenerateContentSettings(
-          model = NonOpenAIModelId.gemini_2_0_flash_exp,
+          model = NonOpenAIModelId.gemini_2_5_pro_exp_03_25,
           systemInstruction = Some(systemPrompt),
           generationConfig = Some(
             GenerationConfig(