build(deps-dev): bump sphinx-rtd-theme from 1.3.0 to 2.0.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.3.0 to 2.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.3.0...2.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

requirements-dev.txt

@@ -22,7 +22,7 @@ Sphinx==3.5.4;python_version>="3.5" and python_version<"3.6"
 Sphinx==5.3.0;python_version>="3.6" and python_version<"3.8"
 Sphinx==7.1.2;python_version>="3.8" and python_version<"3.9"
 Sphinx==7.2.6;python_version>="3.9"
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
 sphinx-tabs==1.1.13;python_version<"3.6"
 sphinx-tabs==3.3.1;python_version>="3.6" and python_version<"3.7"
 sphinx-tabs==3.4.4;python_version>="3.7"