9 files declare their use of ModuleInstallerInterface in Drupal 9

ConfigImporter.php in core/lib/Drupal/Core/Config/ConfigImporter.php

ConfigSingleImportForm.php in core/modules/config/src/Form/ConfigSingleImportForm.php

ConfigSync.php in core/modules/config/src/Form/ConfigSync.php

ModulesListConfirmForm.php in core/modules/system/src/Form/ModulesListConfirmForm.php

ModulesListForm.php in core/modules/system/src/Form/ModulesListForm.php

ModulesUninstallConfirmForm.php in core/modules/system/src/Form/ModulesUninstallConfirmForm.php

ModulesUninstallForm.php in core/modules/system/src/Form/ModulesUninstallForm.php

SiteConfigureForm.php in core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php

TestSiteOliveroInstallTestScript.php in core/tests/Drupal/TestSite/TestSiteOliveroInstallTestScript.php