build(deps-dev): bump ansys-sphinx-theme from 0.12.3 to 0.12.4

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.12.3 to 0.12.4.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.12.3...v0.12.4)

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

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

pyproject.toml

@@ -50,7 +50,7 @@ doc = [
     "Sphinx==7.2.6",
     "ansys-mapdl-core==0.66.0",
     "ansys-mapdl-reader==0.52.20",
-    "ansys-sphinx-theme==0.12.3",
+    "ansys-sphinx-theme==0.12.4",
     "jupyter_sphinx==0.4.0",
     "jupyterlab==4.0.6",
     "numpydoc==1.6.0",