Update MistralModel.py with default values for inputs

[vasconceloscezar]

This pull request updates the MistralModel.py file to modify the default values for the following inputs:

• temperature: changed from 0.1 to 0.5

• max_retries: changed from unspecified to 5

• timeout: changed from unspecified to 60

• max_concurrent_requests: changed from unspecified to 3

• top_p: changed from unspecified to 1

These changes ensure that the default values are set appropriately for the Mistral model.

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Deployment failed with the following error:

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[ogabrielluiz]

LGTM