Bump langchain from 0.0.273 to 0.0.308 in /backend/requirements (#516)

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.273 to 0.0.308.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/v0.0.273...v0.0.308)

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

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dependabot[bot] 2023-10-07 17:18:51 -07:00 committed by GitHub
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@ -21,7 +21,7 @@ httpx==0.23.3
httpx-oauth==0.11.2
huggingface-hub==0.16.4
jira==3.5.1
langchain==0.0.273
langchain==0.0.308
llama-index==0.8.27
Mako==1.2.4
nltk==3.8.1