skip failing test temporarily

[lpenstone]

Skip a test_chat.py test that is causing issues.
This should be followed up with figuring out why it's failing.
See https://github.com/cohere-ai/blobheart/actions/runs/6192869541/job/16813857350
https://cohereai.slack.com/archives/C040SKREJD9/p1694739365506579

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❌ Laura Penstone
❌ lpenstone

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