Fix deprecation warnings for nose-style tests in Pytest 7.2

[stennie]

Pytest 7.2 (released Oct 25, 2022) deprecates running tests written for Nose: https://docs.pytest.org/en/stable/deprecations.html#support-for-tests-written-for-nose

[stennie]

Pinned to non-noisy (still nose-y) Pytest 7.1 via 2fc4b4ed