chore(deps): bump @langchain/core in /sdks/js/langgraph

Bumps [@langchain/core](https://github.com/langchain-ai/langchainjs) from 0.3.39 to 0.3.80.
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Commits](https://github.com/langchain-ai/langchainjs/commits)

---
updated-dependencies:
- dependency-name: "@langchain/core"
  dependency-version: 0.3.80
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

sdks/js/langgraph/package-lock.json

@@ -4,7 +4,7 @@
   "description": "LangGraph SDK integration tests for Sentry",
   "dependencies": {
     "@sentry/node": "10.34.0",
-    "@langchain/core": "0.3.39",
+    "@langchain/core": "0.3.80",
     "@langchain/openai": "0.4.6",
     "@langchain/langgraph": "0.2.31",
     "dotenv": "17.2.3"