fix: Se corrigen errores en 6.8

sale.py

@@ -126,10 +126,6 @@ class Sale(metaclass=PoolMeta):
 
     @classmethod
     def get_invoice(cls, record):
-        pool = Pool()
-        ctx = Transaction().context
-        Shop = pool.get('sale.shop')
-        shop = Shop.search([('id', '=', ctx["shop"])])[0]
         if record.state != 'draft' and record.invoices:
             invoice = record.invoices[0]
             data = {}