Bump langchain from 0.1.36 to 0.2.5

Bumps [langchain](https://github.com/langchain-ai/langchainjs) from 0.1.36 to 0.2.5.
- [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@0.1.36...0.2.5)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -30,7 +30,7 @@
     "@mui/material": "^5.15.18",
     "@xenova/transformers": "^2.17.1",
     "construct-style-sheets-polyfill": "^3.1.0",
-    "langchain": "^0.1.36",
+    "langchain": "^0.2.5",
     "moment": "^2.30.1",
     "pdf-parse": "^1.1.1",
     "pdfjs-dist": "^4.3.136",