build(deps): bump pyvista from 0.46.0 to 0.46.3 in /requirements (#615)

Bumps [pyvista](https://github.com/pyvista/pyvista) from 0.46.0 to 0.46.3.
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@v0.46.0...v0.46.3)

---
updated-dependencies:
- dependency-name: pyvista
  dependency-version: 0.46.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -4,7 +4,7 @@ imageio==2.37.0
 nest-asyncio==1.6.0
 notfound==1.0.2
 pypandoc==1.15
-pyvista==0.46.0
+pyvista==0.46.3
 sphinx-copybutton==0.5.2
 sphinx-gallery==0.19.0
 sphinx-notfound-page==1.1.0