build(deps): bump ansys-sphinx-theme[autoapi] from 1.5.3 to 1.6.3

Bumps [ansys-sphinx-theme[autoapi]](https://github.com/ansys/ansys-sphinx-theme) from 1.5.3 to 1.6.3.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.5.3...v1.6.3)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme[autoapi]
  dependency-version: 1.6.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -33,7 +33,7 @@ tests = ["pytest==8.4.1", "pytest-cov==6.2.1", "pyfakefs==5.9.2"]
 
 doc = [
     "Sphinx==8.2.3",
-    "ansys-sphinx-theme[autoapi]==1.5.3",
+    "ansys-sphinx-theme[autoapi]==1.6.3",
     "numpydoc==1.9.0",
     "sphinx-copybutton==0.5.2",
 ]