Update pytest to 8.1.2

[pyup-bot]

This PR updates pytest from 8.1.1 to 8.1.2.

Changelog

8.1.2

=========================

Bug Fixes
---------

- `12114 <https://github.com/pytest-dev/pytest/issues/12114>`_: Fixed error in :func:`pytest.approx` when used with `numpy` arrays and comparing with other types.

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://data.safetycli.com/changelogs/pytest/

[pyup-bot]

Closing this in favor of #447