Update sphinx-design requirement from <0.5,>=0.3 to >=0.3,<0.6 in /re…

…quirements (#238)

Update sphinx-design requirement in /requirements

Updates the requirements on [sphinx-design](https://github.com/executablebooks/sphinx-design) to permit the latest version.
- [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...v0.5.0)

---
updated-dependencies:
- dependency-name: sphinx-design
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/documentation.txt

@@ -6,6 +6,6 @@ myst-parser[linkify]>=0.13,<2.1
 sphinx>=3.1,<8
 sphinx-autobuild==2021.3.14
 sphinx-copybutton>=0.2,<1
-sphinx-design>=0.3,<0.5
+sphinx-design>=0.3,<0.6
 sphinx-sitemap>=2.4,<3
 toml>=0.10.2