fix(deps): update dependency langchain to v0.3.30

Author: ibm-mend-app[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "env-paths": "^3.0.0",
     "fuse.js": "^7.1.0",
     "jsdom": "^26.0.0",
-    "langchain": "0.3.28",
+    "langchain": "0.3.30",
     "pg": "^8.14.0",
     "playwright": "^1.52.0",
     "psl": "^1.15.0",