Bump sphinx from 5.3.0 to 7.2.6

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 7.2.6.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v5.3.0...v7.2.6)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements_docs.txt

@@ -20,7 +20,7 @@ pytest-sphinx==0.5.0
 pyvista==0.42.3
 pyvista-xarray==0.1.3
 scipy==1.10.0
-Sphinx==5.3.0
+Sphinx==7.2.6
 sphinx-autobuild==2021.3.14
 sphinx-copybutton==0.5.0
 sphinx-gallery==0.15.0