build(deps): bump pyvista from 0.46.3 to 0.46.4 in /requirements

Bumps [pyvista](https://github.com/pyvista/pyvista) from 0.46.3 to 0.46.4.
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@v0.46.3...v0.46.4)

---
updated-dependencies:
- dependency-name: pyvista
  dependency-version: 0.46.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -7,7 +7,7 @@ jupyter_sphinx==0.5.3
 nbsphinx==0.9.5
 pypandoc==1.15
 pytest-sphinx==0.6.3
-pyvista==0.46.3
+pyvista==0.46.4
 sphinx==8.2.3
 sphinx-copybutton==0.5.2
 sphinx-gallery==0.19.0

requirements/requirements_test.txt

@@ -9,5 +9,5 @@ pytest==8.4.2
 pytest-cov==7.0.0
 pytest-order==1.3.0
 pytest-rerunfailures==16.1
-pyvista==0.46.3
+pyvista==0.46.4
 vtk==9.4.2