Bump langchain-community from 0.3.31 to 0.4.1

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.3.31 to 0.4.1.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/commits)

---
updated-dependencies:
- dependency-name: langchain-community
  dependency-version: 0.4.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 langchain-couchbase==0.4.0
 streamlit==1.50.0
-langchain-community==0.3.31
+langchain-community==0.4.1
 pypdf==6.1.1
 langchain-openai==0.3.35