6 files declare their use of Tasks

InstallerObjectTest.php in core/tests/Drupal/Tests/Core/Database/InstallerObjectTest.php
InstallTasksTest.php in core/modules/mysql/tests/src/Unit/InstallTasksTest.php
Tasks.php in core/modules/system/tests/modules/database_statement_monitoring_test/src/mysql/Install/Tasks.php
Tasks.php in core/modules/system/tests/modules/driver_test/src/Driver/Database/DrivertestMysql/Install/Tasks.php
Tasks.php in core/modules/system/tests/modules/driver_test/src/Driver/Database/DrivertestMysqlDeprecatedVersion/Install/Tasks.php
Tasks.php in core/lib/Drupal/Core/Database/Driver/mysql/Install/Tasks.php

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