Bump ansys-sphinx-theme from 0.5.1 to 0.5.2 in /requirements (#46)

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.5.1 to 0.5.2.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.5.1...v0.5.2)

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

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -1,4 +1,4 @@
 Sphinx==5.1.1
 numpydoc==1.4.0  # need latest
-ansys-sphinx-theme==0.5.1
+ansys-sphinx-theme==0.5.2
 sphinx-copybutton==0.5.0