Support for modern Sphinx versions

This repo has known issues with Sphinx 6 and newer (https://github.com/pytorch/pytorch_sphinx_theme/issues/175). Sphinx 6.1 and older do not support Python 3.13, and Python 3.11-3.12 issue deprecation warnings (https://github.com/sphinx-doc/sphinx/issues/10440). Are there any plans to support newer versions of Sphinx as these Python versions also reach EOL?