chore(deps): bump langchain from 0.0.250 to 0.0.329 in /api

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.250 to 0.0.329.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/v0.0.250...v0.0.329)

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

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

api/requirements.txt

@@ -10,7 +10,7 @@ flask-session2==1.3.1
 flask-cors==3.0.10
 gunicorn~=21.2.0
 gevent~=22.10.2
-langchain==0.0.250
+langchain==0.0.329
 openai~=0.28.0
 psycopg2-binary~=2.9.6
 pycryptodome==3.17