requirement on pyvista

[RemDelaporteMathurin]

This pins the pyvista version because it seems like 0.46 brought some breaking changes.

We should try and fix it but in the meantime let's just pin it

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (daa4528) to head (a8355ce).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files           2        2           
  Lines          60       60           
=======================================
  Hits           58       58           
  Misses          2        2           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.