build(deps): bump ansys-sphinx-theme[autoapi]

Bumps the doc-dependencies group with 1 update: [ansys-sphinx-theme[autoapi]](https://github.com/ansys/ansys-sphinx-theme).


Updates `ansys-sphinx-theme[autoapi]` from 1.2.6 to 1.3.1
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.2.6...v1.3.1)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme[autoapi]
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: doc-dependencies
...

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

pyproject.toml

@@ -40,7 +40,7 @@ tests = [
   "pyvista[trame]==0.44.2"
 ]
 doc = [
-  "ansys-sphinx-theme[autoapi]==1.2.6",
+  "ansys-sphinx-theme[autoapi]==1.3.1",
   "ansys-tools-visualization-interface==0.8.1",
   "jupyter-sphinx==0.5.3",
   "numpydoc==1.8.0",