Fix the problem about creating a new migrations

[j0k3r]

It seems there is a problem after upgrading the whole doctrine deps (in #6143) about a field type json_array.

In Exception.php line 112:

  Unknown column type "json_array" requested. Any Doctrine type that you use has to be registered with \Doctrine\DBAL\Types\Type::addType(). You can get a list of all the known types with \Doctrine\DBAL\Types\Type::getTypesMap(). If this error occurs during database introspection then you might have forgotten to register all database types for a Doctrine Type
  . Use AbstractPlatform#registerDoctrineTypeMapping() or have your custom types implement Type#getMappedDatabaseTypes(). If the type name is empty you might have a problem with the cache or forgot some mapping information.

This must be fixed before 2.6.0.