Fix deprecation

[Asenar]

This small fix the following deprecation notice:

[2025-01-15T22:40:38.930794+00:00] deprecation.INFO: User Deprecated: Method "Doctrine\DBAL\Types\Type::getName()" might add "string" as a native return type declaration in the future. Do the same in child class "DoctrineExtensions\Types\CarbonDateType" now to avoid errors or add an explicit @return annotation to suppress this message. {"exception":"[object] (ErrorException(code: 0): User Deprecated: Method \"Doctrine\\DBAL\\Types\\Type::getName()\" might add \"string\" as a native return type declaration in the future. Do the same in child class \"DoctrineExtensions\\Types\\CarbonDateType\" now to avoid errors or add an explicit @return annotation to suppress this message. At vendor/symfony/error-handler/DebugClassLoader.php:341)"} []

(found with symfony 7.2, this not happens in 7.1)