Bump langchain-community from 0.2.1 to 0.2.9 in /python-rag-chatbot

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.2.1 to 0.2.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-community==0.2.1...langchain-community==0.2.9)

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

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

python-rag-chatbot/requirements.txt

@@ -109,7 +109,7 @@ kubernetes==                               29.0.0
 langchain==                                0.2.1
 langchain-cli==                            0.0.24
 langchain-cohere==                         0.1.5
-langchain-community==                      0.2.1
+langchain-community== 0.2.9
 langchain-core==                           0.2.2
 langchain-text-splitters==                 0.2.0
 langchainhub==                             0.1.13