fix: Update Groq model from deprecated llama3-70b-8192 to llama-3.1-70b-versatile

src/enhanced_groq_medical_rag.py

@@ -77,7 +77,7 @@ class EnhancedGroqMedicalRAG:
         # Explicitly create an isolated httpx client for Groq to avoid conflicts
         http_client = httpx.Client()
         self.groq_client = Groq(api_key=self.groq_api_key, http_client=http_client)
-        self.model_name = "llama3-70b-8192"
+        self.model_name = "llama-3.1-70b-versatile"
         
         # Initialize medical enhancement components
         self.logger.info("🏥 Initializing Enhanced Medical RAG System...")