[upd] pypi: Bump pallets-sphinx-themes from 2.1.2 to 2.1.3

Bumps [pallets-sphinx-themes](https://github.com/pallets/pallets-sphinx-themes) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/pallets/pallets-sphinx-themes/releases)
- [Changelog](https://github.com/pallets/pallets-sphinx-themes/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/pallets-sphinx-themes/compare/2.1.2...2.1.3)

---
updated-dependencies:
- dependency-name: pallets-sphinx-themes
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -5,7 +5,7 @@ black==24.3.0
 pylint==3.1.0
 splinter==0.21.0
 selenium==4.20.0
-Pallets-Sphinx-Themes==2.1.2
+Pallets-Sphinx-Themes==2.1.3
 Sphinx<=7.1.2; python_version == '3.8'
 Sphinx==7.3.7; python_version > '3.8'
 sphinx-issues==4.1.0