Bump langchain from 0.0.181 to 0.0.236

Bumps [langchain](https://github.com/hwchase17/langchain) from 0.0.181 to 0.0.236.
- [Release notes](https://github.com/hwchase17/langchain/releases)
- [Commits](https://github.com/hwchase17/langchain/compare/v0.0.181...v0.0.236)

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

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

requirements.txt

@@ -21,7 +21,7 @@ huggingface-hub==0.14.1
 idna==3.4
 Jinja2==3.1.2
 joblib==1.2.0
-langchain==0.0.181
+langchain==0.0.236
 log-symbols==0.0.14
 MarkupSafe==2.1.2
 marshmallow==3.19.0