Merge commit '40ba6e119b7457161fd43b449875d0fb9d473c1a' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/concerns/web_app_controller_concern.rb`:
  Upstream changed the order of Action Controller filters for web app
  controllers.
  Glitch-soc has an extra filter due to its theming system.
  Changed the order accordingly.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Conflict due to an extra newline in glitch-soc.
  Removed that newline and applied upstream's changes.

spec/lib/cache_buster_spec.rb

@@ -28,6 +28,14 @@ describe CacheBuster do
     end
 
     context 'when using default options' do
+      around do |example|
+        # Disables the CacheBuster.new deprecation warning about default arguments.
+        # Remove this `silence` block when default arg support is removed from CacheBuster
+        ActiveSupport::Deprecation.silence do
+          example.run
+        end
+      end
+
       include_examples 'makes_request'
     end