chore(deps): bump langchain in /layers/langchain-common-deps (#22)

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.309 to 0.0.312.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.309...v0.0.312)

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

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

Author: dependabot[bot]

layers/langchain-common-deps/requirements.txt

@@ -2,6 +2,6 @@ boto3>=1.28.61
 botocore>=1.31.61
 requests==2.31.0
 requests-aws4auth==1.2.3
-langchain==0.0.309
+langchain==0.0.312
 opensearch-py==2.3.1
 openai==0.28.1