Upgrade to pytest v8 that removed nose compatibility

[cclauss]

Fixes #1905

• Bump pytest from 7.4.4 to 8.0.0 #1905

pytest v8 removes support for tests written for nose

• https://docs.pytest.org/en/stable/deprecations.html#support-for-tests-written-for-nose

Native pytest support uses setup_method and teardown_method [ ... ]
This is easy to do in an entire code base by doing a simple find/replace.

[Nusnus]

Thank you!