Merge commit '425d77f8124a50fc033e8fb3bdf7b89a6a25f4fa' into glitch-soc/merge-upstream

Conflicts:
- `.rubocop_todo.yml`:
  Upstream regenerated this file, glitch-soc had a specific ignore.
- `README.md`:
  Upstream updated its README, but glitch-soc has a completely different one.
  Kept glitch-soc's README

app/controllers/admin/instances_controller.rb

@@ -65,7 +65,7 @@ module Admin
     end
 
     def filtered_instances
-      InstanceFilter.new(whitelist_mode? ? { allowed: true } : filter_params).results
+      InstanceFilter.new(limited_federation_mode? ? { allowed: true } : filter_params).results
     end
 
     def filter_params