Bump sphinx-design from 0.6.0 to 0.6.1 in /requirements

Bumps [sphinx-design](https://github.com/executablebooks/sphinx-design) from 0.6.0 to 0.6.1.
- [Release notes](https://github.com/executablebooks/sphinx-design/releases)
- [Changelog](https://github.com/executablebooks/sphinx-design/blob/main/CHANGELOG.md)
- [Commits](executablebooks/sphinx-design@v0.6.0...v0.6.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/requirements_docs.txt

@@ -13,5 +13,5 @@ sphinx-copybutton==0.5.2
 sphinx-gallery==0.17.0
 sphinx-notfound-page==1.0.4
 sphinx-reredirects==0.1.3
-sphinx_design==0.6.0
+sphinx_design==0.6.1
 sphinxcontrib-napoleon==0.7