deps: bump langchain core deps (#411)

Author: nicoloboschi

libs/langchain/pyproject.toml

@@ -17,10 +17,10 @@ unstructured = "0.12.5"
 ragstack-ai-colbert = "1.0.1"
 
 # langchain
-langchain = "0.1.17"
-langchain-core = "0.1.48"
-langchain-community = "0.0.36"
-langchain-astradb = "0.2.0"
+langchain = "0.1.19"
+langchain-core = "0.1.52"
+langchain-community = "0.0.38"
+langchain-astradb = "0.3.0"
 langchain-openai = "0.1.3"
 langchain-google-genai = { version = "0.0.11", optional = true }
 langchain-google-vertexai = { version = "1.0.1", optional = true }