[Build] OpenAI test in CI build failing

[riedgar-ms]

The bug

The test
tests/need_credentials/test_azureai_openai.py::test_azureai_openai_chat_longer_2
has started failing in the CI build.

This appears to coincide with the merge of the Rust parser.

To Reproduce

See, e.g.:
https://github.com/guidance-ai/guidance/actions/runs/10631199813/job/29471607890

System info (please complete the following information):

Build machines (Linux, all Python versions specifically)