build: bump sphinx-autobuild in the documentation group

Bumps the documentation group with 1 update: [sphinx-autobuild](https://github.com/sphinx-doc/sphinx-autobuild).


Updates `sphinx-autobuild` from 2024.4.16 to 2024.9.3
- [Release notes](https://github.com/sphinx-doc/sphinx-autobuild/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx-autobuild/blob/main/NEWS.rst)
- [Commits](sphinx-doc/sphinx-autobuild@2024.04.16...2024.09.03)

---
updated-dependencies:
- dependency-name: sphinx-autobuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: documentation
...

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

pyproject.toml

@@ -90,7 +90,7 @@ doc = [
     "pypandoc==1.13",
     "pytest-sphinx==0.6.3",
     "pythreejs==2.4.2",
-    "sphinx-autobuild==2024.4.16",
+    "sphinx-autobuild==2024.9.3",
     "sphinx-autodoc-typehints==1.25.2",
     "sphinx-copybutton==0.5.2",
     "sphinx-design==0.6.1",