cerebras template update for memory (#792)

# What does this PR do?

- we no longer have meta-reference as memory provider, update cerebras
template


## Test Plan

```
python llama_stack/scripts/distro_codegen.py
```

## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

distributions/dependencies.json

@@ -346,6 +346,7 @@
     "blobfile",
     "cerebras_cloud_sdk",
     "chardet",
+    "chromadb-client",
     "datasets",
     "faiss-cpu",
     "fastapi",