Add trailing comma to fix StyleCI

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: stephangroen

src/Picqer/Financials/Moneybird/Entities/RecurringSalesInvoice.php

@@ -57,7 +57,7 @@ class RecurringSalesInvoice extends Model
         'total_price_excl_tax_base',
         'total_price_incl_tax',
         'total_price_incl_tax_base',
-        'subscription'
+        'subscription',
     ];
 
     /**