fix: update symfony/serializer required version

[jockos]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	/
License	MIT

Currently, the required version of the symfony/serializer is ^4.1 but in api-platform/core 2.4 we use an interface that is available only since Serializer v4.2 :
final class ReservedAttributeNameConverter implements AdvancedNameConverterInterface

This creates a nice error like that:

Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the symfony-scripts event terminated with an exception                       

  [RuntimeException]                                                                                                                                                       
  An error occurred when executing the "'cache:clear --no-warmup'" command:                                                                                                
                                                                                                                                                                           
                                                                                                                                                                           
  Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Type error: Argument 2 passed to ApiPlatform\Core\JsonApi\Serializer\ConstraintViolationLi  
  stNormalizer::__construct() must implement interface Symfony\Component\Serializer\NameConverter\NameConverterInterface or be null, instance of ApiPlatform\Core\JsonApi  
  \Serializer\ReservedAttributeNameConverter given, called in /var/www/amms-api/var/cache/dev/ContainerV9modiz/appDevDebugProjectContainer.php on line 6054 in /var/www/a  
  mms-api/vendor/api-platform/core/src/JsonApi/Serializer/ConstraintViolationListNormalizer.php:35                                                                         
  Stack trace:                                                                                                                                                             
  #0 /var/www/amms-api/var/cache/dev/ContainerV9modiz/appDevDebugProjectContainer.php(6054): ApiPlatform\Core\JsonApi\Serializer\ConstraintViolationListNormalizer->__con  
  struct(Object(ApiPlatform\Core\Metadata\Property\Factory\CachedPropertyMetadataFactory), Object(ApiPlatform\Core\JsonApi\Serializer\ReservedAttributeNameConverter))     
  #1 /var/www/amms-api/var/cache/dev/ContainerV9modiz/appDevDebugProjectContainer.php(6333): Con in /var/www/amms-api/vendor/api-platform/core/src/JsonApi/Serializer/Con  
  straintViolationListNormalizer.php on line 35

[meyerbaptiste]

Good catch, thanks @jockos!