chore(deps): bump langchain (#64)

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.317 to 0.0.325.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.317...v0.0.325)

---
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>

lambda/aws-summarization-appsync-stepfn/document_reader/requirements.txt

@@ -1,6 +1,6 @@
 redis
 pypdf2
-langchain==0.0.317
+langchain==0.0.325
 urllib3<2
 aws-xray-sdk
 aws-lambda-powertools