Guix.gnu.org ERR_CERT_DATE_INVALID

[Graham Addis]

Visiting guix.gnu.org this afternoon (uk time) I see the certificate
has expired:

NET::ERR_CERT_DATE_INVALID

Subject: guix.gnu.org

Issuer: R3

Expires on: 11 Jun 2023

Current date: 11 Jun 2023
...