See labscript-suite/labscript-devices#97 for details.

Basically jinja2 removed a deprecated feature in version 3.1 that is called by sphinx 3.5. I had hoped to just update the sphinx pins, but it appears newer versions of sphinx trigger the double import of setuptools' distutils hack via RTD build scripts.

So the fix could take one of three forms:

1. pin down jinja2<3.1
2. submit a PR to RTD to get them to update their distutils calls to modern versions
3. Whitelist distutils in the double import denier

Does anyone have any preferences on which option to take?