Bump sphinx-toolbox from 2.18.2 to 2.18.3 (#88)

Bumps [sphinx-toolbox](https://github.com/sphinx-toolbox/sphinx-toolbox) from 2.18.2 to 2.18.3.
- [Release notes](https://github.com/sphinx-toolbox/sphinx-toolbox/releases)
- [Commits](sphinx-toolbox/sphinx-toolbox@v2.18.2...v2.18.3)

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

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

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

Author: dependabot[bot]

requirements_docs.txt

@@ -1,6 +1,6 @@
 Sphinx==4.5.0
 pyansys-sphinx-theme==0.2.3
 sphinx-copybutton==0.5.0
-sphinx_toolbox==2.18.2
+sphinx_toolbox==2.18.3
 sphinx-tabs>=1.2.1,<3.4.0
 sphinxcontrib-mermaid>=0.7.1