tenancy: [MySQL] Queuing database migration gives me "You cannot serialize or unserialize PDO instances"

Reading your comments on #270 I thought I should queue the database migration, but after setting queue_database_creation to true in config/tenancy.php I get this error:

You cannot serialize or unserialize PDO instances. 

Comming from src\Illuminate\Queue\Queue.php:139.

This is my configuration:

		'queue_database_creation' => true,
		'migrate_after_creation' => true, // run migrations after creating a tenant
		'migration_parameters' => [
			 '--force' => true, // force database migrations
		],
		'seed_after_migration' => true, // should the seeder run after automatic migration
		'seeder_parameters' => [
			'--class' => 'DatabaseSeeder', // root seeder class to run after automatic migrations, e.g.: 'DatabaseSeeder'
			 '--force' => true, // force database seeder
		],