chore(deps): bump langchain-community from 0.2.6 to 0.2.9 in /etl

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.2.6 to 0.2.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-community==0.2.6...langchain-community==0.2.9)

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

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

etl/requirements.txt

@@ -17,7 +17,7 @@ openai==0.27.8
 boto3==1.26.82
 diskcache==5.4.0
 numpy==1.26.4
-langchain-community==0.2.6
+langchain-community==0.2.9
 langchain-openai==0.1.14
 faiss-cpu==1.8.0
 tiktoken==0.4.0