Bump pyvista from 0.43.9 to 0.44.0 in /requirements

Bumps [pyvista](https://github.com/pyvista/pyvista) from 0.43.9 to 0.44.0.
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@v0.43.9...v0.44.0)

---
updated-dependencies:
- dependency-name: pyvista
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements/requirements_doc.txt

@@ -17,7 +17,7 @@ plotly==5.22.0
 pypandoc==1.13
 pytest-sphinx==0.6.3
 pythreejs==2.4.2
-pyvista==0.43.9
+pyvista==0.44.0
 sphinx_design==0.6.0
 Sphinx==7.3.7
 sphinx-autobuild==2024.4.16