Mutation tests break with fatal error

See: https://gitlab.typo3.org/services/t3o-sites/extensions.typo3.org/ter/-/jobs/30462

Fatal error: Uncaught Error: Class 'Composer\InstalledVersions' not found in /builds/services/t3o-sites/extensions.typo3.org/ter/vendor/ocramius/package-versions/src/PackageVersions/Versions.php on line 36
Error: Class 'Composer\InstalledVersions' not found in /builds/services/t3o-sites/extensions.typo3.org/ter/vendor/ocramius/package-versions/src/PackageVersions/Versions.php on line 36