Bump ragstack-ai-knowledge-store to 0.2.0 in ragstack-langchain (#608)

Author: cbornet

libs/langchain/pyproject.toml

@@ -15,7 +15,7 @@ astrapy = "^1"
 cassio = "~0.1.4"
 unstructured = "0.14.5"
 ragstack-ai-colbert = { version = "1.0.5", optional = true }
-ragstack-ai-knowledge-store = { version = "0.1.0", optional = true }
+ragstack-ai-knowledge-store = { version = "0.2.0", optional = true }
 
 # langchain
 langchain = "0.2.10"