Bump pytest-sphinx from 0.6.2 to 0.6.3 in /requirements (#1587)

Bumps [pytest-sphinx](https://github.com/thisch/pytest-sphinx) from 0.6.2 to 0.6.3.
- [Release notes](https://github.com/thisch/pytest-sphinx/releases)
- [Changelog](https://github.com/twmr/pytest-sphinx/blob/master/CHANGELOG.md)
- [Commits](twmr/pytest-sphinx@v0.6.2...v0.6.3)

---
updated-dependencies:
- dependency-name: pytest-sphinx
  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_docs.txt

@@ -5,7 +5,7 @@ imageio==2.34.1
 imageio-ffmpeg==0.4.7
 nbsphinx==0.9.3
 pypandoc==1.13
-pytest-sphinx==0.6.2
+pytest-sphinx==0.6.3
 pyvista==0.36.1
 sphinx==7.1.0
 sphinx-autobuild==2024.2.4