Fix testapp migration conflict

wagtail/test/testapp/migrations/0019_genericsnippetnoindexpage_and_more.py → wagtail/test/testapp/migrations/0020_genericsnippetnoindexpage_and_more.py

@@ -8,7 +8,7 @@ class Migration(migrations.Migration):
 
     dependencies = [
         ("contenttypes", "0002_remove_content_type_name"),
-        ("tests", "0018_alter_streampage_body"),
+        ("tests", "0019_fullfeaturedsnippet_translatable"),
     ]
 
     operations = [