chore: langchain dep bump

backend/requirements.txt

@@ -48,8 +48,8 @@ google-generativeai==0.8.5
 tiktoken
 mcp==1.14.1
 
-langchain==0.3.26
-langchain-community==0.3.27
+langchain==0.3.27
+langchain-community==0.3.29
 
 fake-useragent==2.2.0
 chromadb==1.0.20

pyproject.toml

@@ -54,8 +54,8 @@ dependencies = [
     "google-genai==1.32.0",
     "google-generativeai==0.8.5",
 
-    "langchain==0.3.26",
-    "langchain-community==0.3.27",
+    "langchain==0.3.27",
+    "langchain-community==0.3.29",
 
     "fake-useragent==2.2.0",
     "chromadb==1.0.20",