[BUG] - Import Akeneo boolean attributes in Sylius select attributes

[lruozzi9]

If you import an Akeneo boolean attribute in a Sylius select attribute you will get an error due to this line:

SyliusAkeneoPlugin/src/Converter/ValueConverter.php

Line 38 in 835d89d

if ($attribute->getType() === SelectAttributeType::TYPE && !is_bool($value)) {