Issue #3486713 by ptmkenny, mondrake, spokje: Bump PHPStan to version 2.0.4

composer.json

composer.lock

composer/Metapackage/DevDependencies/composer.json

composer/Metapackage/PinnedDevDependencies/composer.json

core/.phpstan-baseline.php

core/phpstan.neon.dist

...KernelTests/Core/Theme/Icon/IconPackManagerKernelTest.php

...ests/Drupal/Tests/Core/Layout/LayoutPluginManagerTest.php

core/tests/Drupal/Tests/Core/State/StateTest.php

core/tests/PHPStan/composer.json