Update requirements.txt

requirements.txt

@@ -1,13 +1,13 @@
 # --- 필수 ---
-langchain>=0.2
+langchain==0.3
 arxiv
 openai
 ddgs
 numexpr
-langchain-community>=0.2
+langchain-community==0.3
 gradio>=4.42.0
 requests>=2.32.3
-langchain-experimental>=0.2
+langchain-experimental==0.3
 # --- 선택 (위키피디아 / DuckDuckGo / 유튜브 검색용) ---
 duckduckgo-search>=6.2.5
 wikipedia>=1.4.0