The problem: packages.drupal.org broken

I was starting my weekly work for the Drupal GraphQL module by the customary composer update --prefer-source -vvv command, ready to watch composer spit out some hundred lines sipping my coffee, but this time something turned out to be wrong:

&nbsp; [...snip...]<br>Downloading <a href="https://packages.drupal.org/8/drupal/provider-2016-4%24a30289dd8394e5271bd77777bb14b361c5938656f1cddad7fae1c00d5d6ba9c6.json" title="https://packages.drupal.org/8/drupal/provider-2016-4%24a30289dd8394e5271bd77777bb14b361c5938656f1cddad7fae1c00d5d6ba9c6.json">https://packages.drupal.org/8/drupal/provider-2016-4%24a30289dd8394e5271...</a><br><br>&nbsp; [Composer\Downloader\TransportException]<br>&nbsp; The "https://packages.drupal.org/8/drupal/provider-2016-4%24a30289dd8394e5271bd77777bb14b361c5938656f1cddad7fae1c00d5d6ba9c6.json" file could not be downloaded (HTTP/1.1 404 Not Found)<br>&nbsp; [...snip...]

OK, so packages.drupal.org is down for now. How can we work around this ?

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