expired SSL certificate for archive.internal.softwareheritage.org

As per title:

$ curl https://archive.internal.softwareheritage.org/                                                              
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

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Migrated from T1654 (view on Phabricator)