Bump sphinx-toolbox from 3.0.0 to 4.0.0

Bumps [sphinx-toolbox](https://github.com/sphinx-toolbox/sphinx-toolbox) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/sphinx-toolbox/sphinx-toolbox/releases)
- [Changelog](https://github.com/sphinx-toolbox/sphinx-toolbox/blob/master/doc-source/changelog.rst)
- [Commits](sphinx-toolbox/sphinx-toolbox@v3.0.0...v4.0.0)

---
updated-dependencies:
- dependency-name: sphinx-toolbox
  dependency-version: 4.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

development-requirements.txt

@@ -18,7 +18,7 @@ sphinx-prompt==1.9.0
 sphinxext-remoteliteralinclude==0.5.0
 sphinx-rtd-theme==3.0.2
 sphinx-tabs==3.4.7
-sphinx-toolbox==3.0.0
+sphinx-toolbox==4.0.0
 sphinx==8.2.3
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0