Allow any pytest version

[andrewfullard]

:pencil: Description

Type: :beetle: bugfix | :vertical_traffic_light: testing

Removes reliance on deprecated pytest.config. Doesn't actually work properly though, certainly not for cmfgen tests for some reason.

:pushpin: Resources

https://docs.pytest.org/en/7.1.x/example/simple.html#request-example

:vertical_traffic_light: Testing

How did you test these changes?

• [ ] Testing pipeline
• [ ] Other method (describe)
• [ ] My changes can't be tested (explain why)

:ballot_box_with_check: Checklist

• [ ] I requested two reviewers for this pull request
• [ ] I updated the documentation according to my changes
• [ ] I built the documentation by applying the build_docs label

Note: If you are not allowed to perform any of these actions, ping (@) a contributor.

[andrewfullard]

Looks like pytest-arraydiff isn't quite working as expected.

[andrewfullard]

@shreyas3156 can you investigate why the NNDC test in the notebook is failing? It seems to only be a very tiny difference.