build(deps): bump langchain from 0.0.78 to 0.3.5

Bumps [langchain](https://github.com/langchain-ai/langchainjs) from 0.0.78 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@0.0.78...0.3.5)

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

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