Bump langchain from 0.0.275 to 0.0.312

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.275 to 0.0.312.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.275...v0.0.312)

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

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

requirements.txt

@@ -8,7 +8,7 @@ django-fernet-fields==0.6
 django-polymorphic==3.1.0
 django-stubs
 fakeredis==2.16.0
-langchain==0.0.275
+langchain==0.0.312
 mantium-client
 openai==0.27.8
 pinecone-client