update to use new JSONFIELD

Signed-off-by: Nico Schottelius <nico@nico-notebook.schottelius.org>

opennebula/models.py

@@ -1,7 +1,6 @@
 import uuid
 from django.db import models
 from django.contrib.auth import get_user_model
-from django.contrib.postgres.fields import JSONField
 from uncloud_pay.models import Product
 
 # ungleich specific
@@ -13,7 +12,7 @@ storage_class_mapping = {
 
 class VM(Product):
     vmid = models.IntegerField(primary_key=True)
-    data = JSONField()
+    data = models.JSONField()
 
     @property
     def uncloud_name(self):

uncloud/models.py

@@ -1,5 +1,6 @@
 from django.db import models
-from django.contrib.postgres.fields import JSONField
+from django.db.models import JSONField
+
 from django.utils.translation import gettext_lazy as _
 
 class UncloudModel(models.Model):