Update requirements.txt

requirements.txt

@@ -32,11 +32,11 @@ tokenizers>=0.19.1
 accelerate==0.23.0
 
 # LangChain ecosystem (0.2.x family; compatible with langchain-core==0.2.5)
-langchain==0.2.3
-langchain-core==0.2.38,<0.3.0
-langchain-huggingface==0.0.2
+langchain
+langchain-core
+langchain-huggingface
 
 # Use a langchain-community 0.2.x release (compatible with langchain-core 0.2.x)
 # Pick a recent 0.2.x community release instead of 0.0.4 which pins core<0.2
-#langchain-community==0.2.19
+langchain-community
 langchain_openai