Bump langchain

Bumps the npm_and_yarn group with 1 update in the /appsync-bedrock-subscriptions-cdk directory: [langchain](https://github.com/langchain-ai/langchainjs).


Updates `langchain` from 0.0.169 to 0.3.5
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](langchain-ai/langchainjs@0.0.169...0.3.5)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

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

appsync-bedrock-subscriptions-cdk/package.json

@@ -32,6 +32,6 @@
     "aws-cdk-lib": "2.80.0",
     "babel-jest": "^29.7.0",
     "constructs": "^10.0.0",
-    "langchain": "^0.0.169"
+    "langchain": "^0.3.5"
   }
 }