Avoid using yanked pytest version

[harupy]

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Title

https://github.com/mlflow/mlflow/actions/runs/10398635110/job/28796257843#step:9:1288

WARNING: The candidate selected for download or install is a yanked version: 'pytest' candidate (version 8.1.0 at https://files.pythonhosted.org/packages/5a/4a/3f626e3974bea1e6d471bd86f7965c67cd06d5770d1fec9aae445c44da7b/pytest-8.1.0-py3-none-any.whl (from https://pypi.org/simple/pytest/) (requires-python:>=3.8))
Reason for being yanked: See https://github.com/pytest-dev/pytest/issues/12069

8.1.0 seems to work for us.

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[B-Step62]

Do we need to pin pytest?

[harupy]

Good question. I think we should to avoid breaking changes in pytest. For example, pytest 9.0 might be released today and break our tests.

[daniellok-db]

lgtm