minor #62564 [FrameworkBundle] Fix typehint for AbstractController::createForm (silasjoisten)

This PR was merged into the 7.4 branch.

Discussion
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[FrameworkBundle] Fix typehint for `AbstractController::createForm`

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | yes
| New feature?  | no <!-- if yes, also update src/**/CHANGELOG.md -->
| Deprecations? | no <!-- if yes, also update UPGRADE-*.md and src/**/CHANGELOG.md -->
| Issues        | -
| License       | MIT

Fixes a typehint that got changed with the form flow component introduction

Commits
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a011b59a172 fix: Typehint for `createForm` in abstractController

Author: fabpot

Controller/AbstractController.php

@@ -20,6 +20,8 @@
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormFactoryInterface;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\Flow\FormFlowInterface;
+use Symfony\Component\Form\Flow\FormFlowTypeInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\Exception\SessionNotFoundException;
 use Symfony\Component\HttpFoundation\JsonResponse;
@@ -349,6 +351,8 @@ protected function createAccessDeniedException(string $message = 'Access Denied.
 
     /**
      * Creates and returns a Form instance from the type of the form.
+     * 
+     * @return ($type is class-string<FormFlowTypeInterface> ? FormFlowInterface : FormInterface)
      */
     protected function createForm(string $type, mixed $data = null, array $options = []): FormInterface
     {