8 files declare their use of SessionConfigurationInterface in Drupal 9

BigPipeStrategy.php in core/modules/big_pipe/src/Render/Placeholder/BigPipeStrategy.php

BigPipeStrategyTest.php in core/modules/big_pipe/tests/src/Unit/Render/Placeholder/BigPipeStrategyTest.php

Cookie.php in core/modules/user/src/Authentication/Provider/Cookie.php

CsrfRequestHeaderAccessCheck.php in core/lib/Drupal/Core/Access/CsrfRequestHeaderAccessCheck.php

DefaultRequestPolicy.php in core/lib/Drupal/Core/PageCache/DefaultRequestPolicy.php

NoSessionOpen.php in core/lib/Drupal/Core/PageCache/RequestPolicy/NoSessionOpen.php

SessionExistsCacheContext.php in core/lib/Drupal/Core/Cache/Context/SessionExistsCacheContext.php

SessionManagerTest.php in core/tests/Drupal/Tests/Core/Session/SessionManagerTest.php