Merge commit 'dc09c10fa8cc9230bf14e48d790c8f0c26043f8f' into glitch-soc/merge-upstream

Conflicts:
- `.rubocop_todo.yml`:
  Upstream re-generated the file, while glitch-soc has a specific ignore
  for some file.
  Updated the file as upstream did and kept our extra ignore.
- `config/webpack/shared.js`:
  Upstream added a plugin, but our files are pretty different.
  Added the plugin as well.
- `spec/helpers/application_helper_spec.rb`:
  Upstream refactored tests, but part of them were different because
  of glitch-soc's theming system.
  Applied the refactoring to glitch-soc's change.

lib/redis/namespace_extensions.rb

@@ -2,8 +2,8 @@
 
 class Redis
   module NamespaceExtensions
-    def exists?(*args, &block)
-      call_with_namespace('exists?', *args, &block)
+    def exists?(...)
+      call_with_namespace('exists?', ...)
     end
   end
 end