chore(deps): bump @langchain/community in /packages/sample-app

Bumps [@langchain/community](https://github.com/langchain-ai/langchainjs) from 0.3.49 to 0.3.50.
- [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/compare/@langchain/community==0.3.49...@langchain/core==0.3.50)

---
updated-dependencies:
- dependency-name: "@langchain/community"
  dependency-version: 0.3.50
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/sample-app/package.json

@@ -49,7 +49,7 @@
     "@google-cloud/aiplatform": "^4.4.0",
     "@google-cloud/vertexai": "^1.10.0",
     "@langchain/aws": "^0.1.12",
-    "@langchain/community": "^0.3.49",
+    "@langchain/community": "^0.3.50",
     "@langchain/core": "^0.3.58",
     "@langchain/openai": "^0.6.2",
     "@llamaindex/openai": "^0.4.10",