Refs #12990 -- Moved CheckFieldDefaultMixin to the django.db.models.fields.mixins.

tests/postgres_tests/test_hstore.py

@@ -231,7 +231,7 @@ class TestChecks(PostgreSQLSimpleTestCase):
                 ),
                 hint='Use a callable instead, e.g., use `dict` instead of `{}`.',
                 obj=MyModel._meta.get_field('field'),
-                id='postgres.E003',
+                id='fields.E010',
             )
         ])