Issue 1:
Composer 2.3.0 dropped support for PHP <7.2.5 and you are running 7.1.33-44+0~20211119.61+debian9~1.gbp448fbe, please upgrade PHP or use Composer 2.2 LTS via "composer self-update --2.2". Aborting.
Issue 2:
Fatal error: Declaration of Composer\IO\BaseIO::hasAuthentication($repositoryName) must be compatible with Composer\IO\IOInterface::hasAuthentication(string $repositoryName) in
Issue 1: Composer 2.3.0 dropped support for PHP <7.2.5 and you are running 7.1.33-44+0~20211119.61+debian9~1.gbp448fbe, please upgrade PHP or use Composer 2.2 LTS via "composer self-update --2.2". Aborting.
Issue 2: Fatal error: Declaration of Composer\IO\BaseIO::hasAuthentication($repositoryName) must be compatible with Composer\IO\IOInterface::hasAuthentication(string $repositoryName) in
https://github.com/composer/composer/issues/10709