[fix] migration script

models/ur_month_timesheet.py

@@ -36,7 +36,7 @@ class ScopMonthTimesheet(models.Model):
         return self.env["res.company"]._ur_default_get()
 
     year = fields.Selection(
-        selection=get_years(), string="Année", default=fields.Date.today().year
+        selection=get_years(), string="Année", default=str(fields.Date.today().year)
     )
     month = fields.Selection(selection=MONTHS, string="Mois")
     company_id = fields.Many2one(