Bump sphinx-toolbox from 3.8.0 to 3.8.1 in /core

Bumps [sphinx-toolbox](https://github.com/sphinx-toolbox/sphinx-toolbox) from 3.8.0 to 3.8.1.
- [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@v3.8.0...v3.8.1)

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

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

core/pyproject.toml

@@ -88,7 +88,7 @@ docs = [
     "sphinx-autobuild == 2024.10.3",
     "sphinx-csv-filter == 0.4.2",
     "sphinx-copybutton == 0.5.2",
-    "sphinx-toolbox == 3.8.0",
+    "sphinx-toolbox == 3.8.1",
     "sphinxcontrib-spelling == 8.0.0",
 ]