CI: (deps): Bump sphinx-design from 0.5.0 to 0.6.0 in /ci

Bumps [sphinx-design](https://github.com/executablebooks/sphinx-design) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/executablebooks/sphinx-design/releases)
- [Changelog](https://github.com/executablebooks/sphinx-design/blob/main/CHANGELOG.md)
- [Commits](executablebooks/sphinx-design@v0.5.0...v0.6.0)

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

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

ci/doc_requirements.txt

@@ -1,6 +1,6 @@
 sphinx==7.3.7
 pydata-sphinx-theme==0.15.2
-sphinx-design==0.5.0
+sphinx-design==0.6.0
 sphinx-gallery==0.16.0
 myst-parser==3.0.1
 netCDF4==1.7.1