chore(deps): Bump @langchain/core from 0.3.30 to 0.3.31

Bumps [@langchain/core](https://github.com/langchain-ai/langchainjs) from 0.3.30 to 0.3.31.
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](https://github.com/langchain-ai/langchainjs/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

packages/langchain/package.json

@@ -30,7 +30,7 @@
     "@sap-ai-sdk/core": "workspace:^",
     "@sap-ai-sdk/foundation-models": "workspace:^",
     "@sap-cloud-sdk/connectivity": "^3.25.0",
-    "@langchain/core": "0.3.30",
+    "@langchain/core": "0.3.31",
     "zod-to-json-schema": "^3.24.1"
   }
 }