llm: update langchain to 0.3 + dependencies

Author: haraldschilly

src/packages/package.json

@@ -20,7 +20,7 @@
       "undici@<5.28.3": "^5.28.4",
       "postcss@<8.4.31": "^8.4.31",
       "retry-request@<7.0.1": "^7.0.2",
-      "@langchain/core": "^0.2.17",
+      "@langchain/core": "^0.3.11",
       "katex@<0.16.9": "^0.16.10"
     }
   }