unable to update plugins after a Moodle update

After upgrading our 4 Moodle instances to the latest minor version, 

Site Administration > Plugins > Plugins overview > Check for available updates button returns "Unable to fetch available updates data - unexpected HTTP response code."

Probably the cause is Moodle's Cloudflare ray rejecting the request from our server with a 403 (I verified that it was sending a 403 with curl) as mentioned in this thread, https://moodle.org/mod/forum/discuss.php?d=429373

So I'll try again later.