build(deps): bump pyvista from 0.43.10 to 0.44.0 in /requirements (#475)

Bumps [pyvista](https://github.com/pyvista/pyvista) from 0.43.10 to 0.44.0.
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@v0.43.10...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/requirements_doc.txt

@@ -6,4 +6,4 @@ sphinx_design==0.6.0
 sphinxcontrib-mermaid>=0.7.1
 sphinx-gallery==0.16.0
 Pillow>=9.0
-pyvista==0.43.10
+pyvista==0.44.0