Bump PendingDeprecationWarning to DeprecationWarning

* as it is a major release 3, start right away from DeprecationWarning for ObjectTypes missing fields or exclude option

Author: radekwlsk

graphene_django/tests/test_types.py

@@ -482,7 +482,7 @@ class Meta:
 @with_local_registry
 def test_django_objecttype_neither_fields_nor_exclude():
     with pytest.warns(
-        PendingDeprecationWarning,
+        DeprecationWarning,
         match=r"Creating a DjangoObjectType without either the `fields` "
         "or the `exclude` option is deprecated.",
     ):

graphene_django/types.py

@@ -226,7 +226,7 @@ def __init_subclass_with_meta__(
                 "or the `exclude` option is deprecated. Add an explicit `fields "
                 "= '__all__'` option on DjangoObjectType {class_name} to use all "
                 "fields".format(class_name=cls.__name__,),
-                PendingDeprecationWarning,
+                DeprecationWarning,
                 stacklevel=2,
             )