Bump ansys-sphinx-theme from 1.1.6 to 1.2.0

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 1.1.6 to 1.2.0.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.1.6...v1.2.0)

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

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

requirements/requirements_docs.txt

@@ -9,6 +9,6 @@ pytest-sphinx==0.6.3
 sphinx-notfound-page==1.0.4
 sphinx-copybutton==0.5.0
 sphinx-gallery==0.18.0
-ansys_sphinx_theme==1.1.6
+ansys_sphinx_theme==1.2.0
 sphinx-autodoc-typehints==2.5.0
 pyvista==0.44.1