build(deps): bump ansys-sphinx-theme[autoapi] from 1.1.7 to 1.2.1

Bumps [ansys-sphinx-theme[autoapi]](https://github.com/ansys/ansys-sphinx-theme) from 1.1.7 to 1.2.1.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.1.7...v1.2.1)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -56,7 +56,7 @@ tests = [
 ]
 doc = [
     "Sphinx==8.1.3",
-    "ansys-sphinx-theme[autoapi]==1.1.7",
+    "ansys-sphinx-theme[autoapi]==1.2.1",
     "build>= 0.10.0",
     "flit>=3.8.0",
     "inflect==7.4.0",