Bump langchain from 0.3.0 to 0.3.1 (#4510)

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.3.0...langchain==0.3.1)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -2,7 +2,7 @@ amqp==5.2.0
 beautifulsoup4==4.12.3
 boto3==1.35.24
 imbalanced-learn==0.12.3
-langchain==0.3.0
+langchain==0.3.1
 langchain-community==0.3.0
 langchain-openai==0.2.0
 libmozdata==0.2.7