Certificate of docs.nyc1.psf.io has expired

I'm getting 503 Service Unavailable errors on docs.python.org in prod.

Trying to investigate, looks like an expired certificate:

    root@docs:/var/log/nginx# curl --resolve docs.python.org:9000:127.0.0.1 https://docs.python.org:9000/3/glossary.html
    curl: (60) SSL certificate problem: certificate has expired
