chore(deps): bump langchain from 0.3.14 to 0.3.15

Author: mikesprague

package-lock.json

@@ -47,7 +47,7 @@
     "gpt-tokenizer": "2.8.1",
     "he": "1.2.0",
     "jotai": "2.11.1",
-    "langchain": "0.3.14",
+    "langchain": "0.3.15",
     "markdown-to-txt": "2.0.1",
     "nanoid": "5.0.9",
     "next": "15.1.6",