Remove usage of deprecated Model and Serializer fields (#1663)

api/funkwhale_api/audio/models.py

@@ -2,7 +2,7 @@ import uuid
 
 
 from django.contrib.contenttypes.fields import GenericRelation
-from django.contrib.postgres.fields import JSONField
+from django.db.models import JSONField
 from django.core.serializers.json import DjangoJSONEncoder
 from django.db import models
 from django.urls import reverse