test(inference): update the Cerebras model ID (#6366)

## Summary

- Moves the Cerebras integration test target and generated model table
from retired Llama 3.3 to gpt-oss-120b.
- The current public catalog is `gpt-oss-120b`, `zai-glm-4.7`, and
`gemma-4-31b`.

## Why

The previous model ID was retired or the fixed catalog was missing a
currently available Cerebras model. This could produce failed requests,
stale autocomplete, or misleading examples.

## Validation

- Python syntax parsing and git diff check.
- Source of truth: https://api.cerebras.ai/public/v1/models

Co-authored-by: Matthew Farrellee <matt@cs.wisc.edu>

Author: ryanl-cerebras

tests/integration/TARGET_MODELS.md

@@ -59,7 +59,7 @@ Cron: `1 0 * * 0`
 | Setup | Text Model | Vision Model | Embedding Model | Safety Model | Default CI | Scheduled CI |
 |-------|------------|--------------|-----------------|--------------|------------|--------------|
 | `anthropic` | anthropic/claude-3-5-haiku-20241022 | — | — | — | — | — |
-| `cerebras` | cerebras/llama-3.3-70b | — | — | — | — | — |
+| `cerebras` | cerebras/gpt-oss-120b | — | — | — | — | — |
 | `databricks` | databricks/databricks-meta-llama-3-3-70b-instruct | — | databricks/databricks-bge-large-en | — | — | — |
 | `fireworks` | fireworks/accounts/fireworks/models/llama-v3p1-8b-instruct | — | fireworks/accounts/fireworks/models/qwen3-embedding-8b | — | — | — |
 | `groq` | groq/llama-3.3-70b-versatile | — | — | — | — | — |

tests/integration/suites.py

@@ -196,7 +196,7 @@ class Setup(BaseModel):
         name="cerebras",
         description="Cerebras models",
         defaults={
-            "text_model": "cerebras/llama-3.3-70b",
+            "text_model": "cerebras/gpt-oss-120b",
         },
     ),
     "databricks": Setup(