build(deps-dev): bump ansys-sphinx-theme from 0.12.5 to 0.13.0

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.12.5 to 0.13.0.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.12.5...v0.13.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -56,7 +56,7 @@ doc = [
     "sphinx-copybutton==0.5.2",
     "sphinx-gallery==0.15.0",
     "sphinx-autodoc-typehints==1.25.2",
-    "ansys-sphinx-theme==0.12.5",
+    "ansys-sphinx-theme==0.13.0",
     "pypandoc==1.12",
     "nbsphinx==0.9.3",
     "ipywidgets==8.1.1",