Specifying pygments_style in conf.py doesn't work

[rht]

Problem

I tried to change the pygments_style in my project: projectmesa/mesa#1719. I have waited for #1463 so that I can use Sphinx 7.

However, the build still uses the default sphinx pygments_style: https://mesa--1719.org.readthedocs.build/en/1719/useful-snippets/snippets.html.

Any idea what went wrong and how to fix it? The project has existed before 2019, and so https://blog.readthedocs.com/python-core-requirements-changed/ doesn't affect it.