Bump ansys-sphinx-theme from 0.13.4 to 0.14.0 in /requirements

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.13.4 to 0.14.0.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.13.4...v0.14.0)

---
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_doc.txt

@@ -1,5 +1,5 @@
 Sphinx<8
-ansys-sphinx-theme==0.13.4
+ansys-sphinx-theme==0.14.0
 imageio==2.34.0
 nest-asyncio==1.6.0
 notfound==1.0.2