security: Update Langchain versions (#894)

awaiting testing

Author: tianjing-li

poetry.lock

@@ -25,9 +25,9 @@ httpx = {extras = ["http2"], version = "^0.27.0"}
 chromadb = "^0.4.16"
 cohere = "^5.5.7"
 inquirer = "^3.2.4"
-langchain = "0.2.15"
+langchain = "0.2.17"
 langchain-cohere = "^0.1.1"
-langchain-community = "0.2.15"
+langchain-community = "0.2.19"
 py-expression-eval = "^0.3.14"
 tavily-python = "^0.3.3"
 arxiv = "^2.1.0"
@@ -88,7 +88,7 @@ fastapi = "0.115.5"
 psycopg2 = "^2.9.9"
 boto3 = "^1.0.0"
 py-expression-eval = "^0.3.14"
-langchain = "0.2.15"
+langchain = "0.2.17"
 langchain-cohere = "^0.1.1"
 tavily-python = "^0.3.3"