compserのアップグレード
Warning from https://repo.packagist.org: You are using an outdated version of Composer. Composer 2.0 is now available and you should upgrade. See https://getcomposer.org/2
# composer selfupdate Updating to version 2.0.10 (stable channel). Downloading (100%) Use composer self-update --rollback to return to version 1.8.0