This PR was merged into the 5.4 branch.Discussion----------[Form] Fix return types in form builder| Q             | A| ------------- | ---| Branch?       | 5.4| Bug fix?      | no| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tickets       || License       | MIT| Doc PR        |Fix return types incompatibilities found by psalm in#42511> Error: The declared return type 'Symfony\Component\EventDispatcher\EventDispatcherInterface' for Symfony\Component\Form\ButtonBuilder::getEventDispatcher is not nullable, but 'null' contains null (seehttps://psalm.dev/144)Error: The declared return type 'string' for Symfony\Component\Form\ButtonBuilder::getAction is not nullable, but 'null' contains null (seehttps://psalm.dev/144)Error: The declared return type 'string' for Symfony\Component\Form\ButtonBuilder::getMethod is not nullable, but 'null' contains null (seehttps://psalm.dev/144)Error: The declared return type 'Symfony\Component\Form\RequestHandlerInterface' for Symfony\Component\Form\ButtonBuilder::getRequestHandler is not nullable, but 'null' contains null (seehttps://psalm.dev/144)Error: The declared return type 'Symfony\Component\Form\FormFactoryInterface' for Symfony\Component\Form\FormConfigBuilder::getFormFactory is not nullable, but 'Symfony\Component\Form\FormFactoryInterface|null' contains null (seehttps://psalm.dev/144)Error: The declared return type 'string' for Symfony\Component\Form\FormConfigBuilder::getAction is not nullable, but 'null|string' contains null (seehttps://psalm.dev/144)Commits-------ea606ea [Form] Fix return types in form builder