Build(deps): Bump ansys-sphinx-theme from 1.6.0 to 1.6.1

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.6.0...v1.6.1)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme
  dependency-version: 1.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -47,7 +47,7 @@ tests = [
 ]
 doc = [
     "Sphinx==8.1.3",
-    "ansys-sphinx-theme==1.6.0",
+    "ansys-sphinx-theme==1.6.1",
     "sphinx-copybutton==0.5.2",
     "sphinx_design==0.6.1",
     "sphinx_toolbox==4.0.0",