date model attributes have object type instead of string type

[layerok]

This is regression of #239

As I understood this bug was reintroduced after adding support for inferring types of model attributes from model casts

scramble/src/Support/InferExtensions/ModelExtension.php

Lines 133 to 134 in 4752b98

	'date', 'datetime', 'custom_datetime' => new ObjectType(Carbon::class),
	'immutable_date', 'immutable_datetime', 'immutable_custom_datetime' => new ObjectType(CarbonImmutable::class),

[romalytvynenko]

@layerok I would be happy to accept a PR for this issue with some tests 😇