maint: bump ansys-sphinx-theme from 0.13.3 to 0.13.4

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.13.3 to 0.13.4.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.13.3...v0.13.4)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -35,7 +35,7 @@ tests = [
     "parameterized==0.9.0",
 ]
 doc = [
-    "ansys-sphinx-theme==0.13.3",
+    "ansys-sphinx-theme==0.13.4",
     "enum-tools[sphinx]==0.11.0",
     "numpydoc==1.5.0",
     "sphinx==7.2.6",