Dependabot: LangChain pickle deserialization of untrusted data

[tlindsay42]

A vulnerability in the FAISS.deserialize_from_bytes function of langchain-ai/langchain allows for pickle deserialization of untrusted data. This can lead to the execution of arbitrary commands via the os.system function. The issue affects versions prior to 0.2.4.

Had to create this manually since Dependabot can't auto-generate a PR without a lock file.

Affected files:

• lambda/aws-rag-appsync-stepfn-opensearch/embeddings_job/src/requirements.txt
• lambda/aws-rag-appsync-stepfn-opensearch/s3_file_transformer/src/requirements.txt