Bump langchain from 0.0.252 to 0.0.308 in /scripts

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.252 to 0.0.308.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/v0.0.252...v0.0.308)

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

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

scripts/requirements.txt

@@ -47,7 +47,7 @@ javalang==0.13.0
 Jinja2==3.1.2
 jmespath==1.0.1
 joblib==1.3.1
-langchain==0.0.252
+langchain==0.0.308
 lxml==4.9.3
 manifest-ml==0.1.8
 MarkupSafe==2.1.3