MAINT: Bump sphinx from 6.2.1 to 8.0.2

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.2.1 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v6.2.1...v8.0.2)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -40,7 +40,7 @@ tests = [
 doc = [
     "ansys-sphinx-theme==1.0.2",
     "numpydoc==1.7.0",
-    "Sphinx==6.2.1", # BLOCKED BY sphinx-design - Cannot upgrade to Sphinx 7 for now
+    "Sphinx==8.0.2", # BLOCKED BY sphinx-design - Cannot upgrade to Sphinx 7 for now
     "sphinx-copybutton==0.5.2",
     "sphinx_design==0.6.1",
     "sphinx-gallery==0.17.1",