Bump langchain-community from 0.2.5 to 0.2.9 in /lib/rag/layer

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.2.5 to 0.2.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-community==0.2.5...langchain-community==0.2.9)

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

Signed-off-by: dependabot[bot] <[email protected]>

lib/rag/layer/requirements.txt

@@ -2,7 +2,7 @@ opensearch-py==2.6.0
 requests-aws4auth==1.2.3
 PyPDF2==3.0.1
 langchain==0.2.5
-langchain-community==0.2.5
+langchain-community==0.2.9
 langchain-openai==0.1.8
 pgvector==0.2.5
 psycopg2-binary==2.9.9