misc: Fix typing for client timeout

[adamantike]

The timeout parameter in the NixtlaClient class can be set as None to disable the timeout, as explained in the docstring.

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[ngupta23]

@adamantike - Thanks for the PR. We use nbdev for developing this repo. You may need to update the notebook instead of the py file and then use nbdev_export to create the py files from it. Please see the instructions here. I hope this helps.

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[adamantike]

Thanks for the context! I should have checked out the contributing guidelines, but thought it was a one-line fix. PR updated!