BUILD: Bump sphinx-autobuild from 2024.2.4 to 2024.9.3 (#768)

* BUILD: Bump sphinx-autobuild from 2024.2.4 to 2024.9.3

Bumps [sphinx-autobuild](https://github.com/sphinx-doc/sphinx-autobuild) from 2024.2.4 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@2024.02.04...2024.09.03)

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

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

* Update pyproject.toml

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sébastien Morais <146729917+SMoraisAnsys@users.noreply.github.com>

pyproject.toml

@@ -60,7 +60,7 @@ doc = [
     # NOTE: Remove recommonmark once examples are reworked.
     "recommonmark",
     "Sphinx>=7.1.0,<8.1",
-    "sphinx-autobuild==2024.2.4; python_version == '3.8'",
+    "sphinx-autobuild==2021.3.14; python_version == '3.8'",
     "sphinx-autobuild==2024.2.4; python_version > '3.8'",
     "sphinx-copybutton>=0.5.0,<0.6",
     "sphinx-gallery>=0.14.0,<0.18",