Update pyvista dependency in pyproject.toml

[RemDelaporteMathurin]

Following discussion in pyvista/pyvista#8112 we should not pin pyvista like this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (5fa07a2) to head (f87b1de).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files           2        2           
  Lines          60       60           
=======================================
  Hits           58       58           
  Misses          2        2           

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