chore: upgrade LangChain deps in ai-service

Bump LangChain-related dependencies in ai-service: @langchain/classic 1.0.2→1.0.34, @langchain/community 1.0.2→1.1.28, @langchain/core 1.0.4→1.1.48, @langchain/openai 1.1.0→1.4.7, @langchain/textsplitters 1.0.0→1.0.1, and langchain 1.0.4→1.4.2. These updates align the service with newer LangChain releases for improved compatibility and fixes; yarn.lock was updated to reflect the dependency changes.

Signed-off-by: Alex Piatakov <alex.piatakov@swirldslabs.com>

Author: Pyatakov

ai-service/package.json

@@ -6,11 +6,11 @@
     "dependencies": {
         "@guardian/common": "3.6.0-rc",
         "@guardian/interfaces": "3.6.0-rc",
-        "@langchain/classic": "1.0.2",
-        "@langchain/community": "1.0.2",
-        "@langchain/core": "1.0.4",
-        "@langchain/openai": "1.1.0",
-        "@langchain/textsplitters": "1.0.0",
+        "@langchain/classic": "1.0.34",
+        "@langchain/community": "1.1.28",
+        "@langchain/core": "1.1.48",
+        "@langchain/openai": "1.4.7",
+        "@langchain/textsplitters": "1.0.1",
         "@mikro-orm/core": "6.4.16",
         "@mikro-orm/mongodb": "6.4.16",
         "@nestjs/common": "^11.0.11",
@@ -20,7 +20,7 @@
         "dotenv": "^16.3.1",
         "express": "^5.1.0",
         "faiss-node": "0.5.1",
-        "langchain": "1.0.4",
+        "langchain": "1.4.2",
         "module-alias": "2.2.3",
         "prebuild": "13.0.1",
         "rxjs": "^7.8.1",