I know @Ejegg was getting this last night too (or at least, very similar errors)...
https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/583064/
https://integration.wikimedia.org/ci/job/mediawiki-core-php72-phan-docker/17620/console
13:25:50 ++ /usr/bin/env 13:25:51 [7.7MB/0.02s] > ComposerHookHandler::onPreUpdate 13:25:51 [7.8MB/0.02s] Loading composer repositories with package information 13:25:51 [8.1MB/0.13s] Updating dependencies (including require-dev) 13:26:03 [312.5MB/11.73s] Package operations: 56 installs, 5 updates, 3 removals 13:26:03 [312.5MB/11.73s] - Removing wikimedia/ip-utils (1.0.0) 13:26:03 [312.5MB/11.75s] - Removing jakobo/hotp-php (v1.0.1) 13:26:03 [312.5MB/11.78s] - Removing christian-riesen/base32 (1.3.2) 13:26:03 [312.5MB/11.81s] - Updating ralouphie/getallheaders (2.0.5 => 3.0.3): [312.5MB/11.84s] Downloading 13:26:03 13:26:03 [Composer\Downloader\TransportException] 13:26:03 Could not authenticate against github.com 13:26:03