Update dependency langchain to ^0.0.77

Author: renovate[bot]

package-lock.json

@@ -20,7 +20,7 @@
     "body-parser": "^1.20.2",
     "cors": "^2.8.5",
     "express": "^4.18.2",
-    "langchain": "^0.0.68",
+    "langchain": "^0.0.77",
     "source-map-support": "^0.5.21"
   },
   "devDependencies": {