CI: locking pytest version = 8.1.0

[natmokval]

• closes BUG: Pytest Version >=8.1 #57718

locked pytest to version more then 8.1.0, as a temporary solution.

the reason: with the latest pytest version 8.1.0 we get an error when runninig pytest

File "/home/panda/miniforge3/envs/pandas-dev/lib/python3.10/site-packages/pluggy/_manager.py", line 342, in _verify_hook
    raise PluginValidationError(
pluggy._manager.PluginValidationError: Plugin 'pytest_cython' for hook 'pytest_collect_file'
hookimpl definition: pytest_collect_file(path, parent)
Argument(s) {'path'} are declared in the hookimpl but can not be found in the hookspec

I think, it’s a bug in the last version of pytest-cython-0.2.1 (see link)
which is related to enforcing deprecation of path parameter in the last version of pytest 8.1.0 (see link)

[mroeschke]

I think the pytest devs just yanked 8.1 from pypi and conda forge so we may not need this anymore: pytest-dev/pytest#12069

e.g. https://github.com/pandas-dev/pandas/actions/runs/8146954729/job/22266609711#step:4:427

[natmokval]

indeed, seems we don't need this anymore. Thank you, @mroeschke, I will close this PR.

[mroeschke]

Thanks for being proactive on this!