fix: fix override model save method

[hugobrilhante]

This PR aims to fix a, perhaps critical, issue, which was the overlap of the save method in the model. Without the correction, it is not possible to perform actions as shown in the example because the save method will never be executed.

@publish([
    Config(destination='/destination')
])
class Order(models.Model):

    id = models.AutoField(primary_key=True)

    def save(self, *args, **kwargs):
        logger.info("Override save method")
        super().save(*args, **kwargs)

    def __str__(self):
        return f"{self.id}"