Update ollama_model.py

[Dennis-yxchen]

there will be an error if using response.response

AttributeError: 'dict' object has no attribute 'response'

As a result, change response.response to response['response']

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

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[jzleibo]

Looks like you need to agree to the CLA which was probably sent to you by email

[Dennis-yxchen]

Thanks! I just agreed to the CLA : )

[jzleibo]

We have approved it on our end, are you able to click a button to merge it now? The system doesn't seem to allow me to do it myself.

[Dennis-yxchen]

I am also not allowed to click the button, and Only those with [write access](https://docs.github.com/en/get-started/learning-about-github/access-permissions-on-github) to this repository can merge pull requests appears near the button.

[jzleibo]

Looks like this got merged somehow by magic? Here it is: 9dd73cc So it looks like it all worked, but somehow got detached from this pull request itself. Very weird. I'll go ahead and close this one now. Let me know if there are any issues and feel free to re-open.