[Bug]: Gemini 3.5 Flash doesn't return log probs

### File Name

gemini/logprobs/intro_logprobs.ipynb

### What happened?

When I run the cell containing this code:
```
prompt = """
I am not sure if I really like this restaurant a lot.
"""

response_schema = {"type": "STRING", "enum": ["Positive", "Negative", "Neutral"]}

response = client.models.generate_content(
model=MODEL_ID,
contents=prompt,
config=GenerateContentConfig(
response_mime_type="text/x.enum",
response_schema=response_schema,
response_logprobs=True, # default to False
logprobs=3, # [1-20]
),
)

print(response.text)
```

I get this error:
```
ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': 'Unable to submit request because Logprobs is not supported for this model.
```

### Relevant log output

```shell

```

### Code of Conduct

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