chore(deps): bump langchain-community from 0.3.26 to 0.3.27 in /samples

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.3.26 to 0.3.27.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.3.26...langchain==0.3.27)

---
updated-dependencies:
- dependency-name: langchain-community
  dependency-version: 0.3.27
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-aiplatform[reasoningengine,langchain]==1.90.0
 google-cloud-resource-manager==1.14.2
-langchain-community==0.3.26
+langchain-community==0.3.27
 langchain-google-alloydb-pg==0.12.0
 langchain-google-vertexai==2.0.20