Bump langchain-community from 0.0.25 to 0.2.9 in /services/engine

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.0.25 to 0.2.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-cli==0.0.25...langchain-community==0.2.9)

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

Signed-off-by: dependabot[bot] <support@github.com>

services/engine/requirements.txt

@@ -2,7 +2,7 @@ dnspython==2.3.0
 fastapi==0.98.0
 httpx==0.27.0
 langchain==0.1.11
-langchain-community==0.0.25
+langchain-community==0.2.9
 langchain-openai==0.0.8
 load-dotenv==0.1.0
 mypy-extensions==1.0.0