fix: gemini 모델명 수정

Author: sheepyis

.github/workflows/gemini_review.yml

@@ -52,7 +52,8 @@ jobs:
 
             const { GoogleGenerativeAI } = require("@google/generative-ai");
             const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY);
-            const model = genAI.getGenerativeModel({ model: "gemini-2.0-flash-exp" });
+            const model = genAI.getGenerativeModel({ model: "gemini-1.5-flash" });
+
 
             const prompt = `
             당신은 **시니어 프론트엔드 개발자**입니다.