Bump sphinx-design from 0.3.0 to 0.4.1

Bumps [sphinx-design](https://github.com/executablebooks/sphinx-design) from 0.3.0 to 0.4.1.
- [Release notes](https://github.com/executablebooks/sphinx-design/releases)
- [Changelog](https://github.com/executablebooks/sphinx-design/blob/main/CHANGELOG.md)
- [Commits](executablebooks/sphinx-design@v0.3.0...v0.4.1)

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

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

requirements/docs.txt

@@ -7,7 +7,7 @@ sphinxcontrib-apidoc>=0.3.0, <0.4.0
 sphinxcontrib-bibtex>=2.1.0, <3.0.0
 myst-parser>=0.14, <0.19
 nbsphinx>=0.8.5, <0.10.0
-sphinx_design==0.3.0  # Pinning for now as sphinx_design is v.new and still in flux.
+sphinx_design==0.4.1  # Pinning for now as sphinx_design is v.new and still in flux.
 ipykernel>=5.1.0, <7.0.0 # required for executing notebooks via nbsphinx
 ipython>=7.2.0, <9.0.0 # required for executing notebooks nbsphinx
 # pandoc