Merge commit 'ca41a95872545502dbc6bae6f7237ee20acc38ee' into glitch-soc/merge-upstream

Conflicts:
- `spec/helpers/theme_helper_spec.rb`:
  Conflict due to glitch-soc's different theming system.
  Adapted upstream changes to glitch-soc's theming system.

.github/renovate.json5

@@ -39,7 +39,6 @@
       // Require Dependency Dashboard Approval for major version bumps of these Ruby packages
       matchManagers: ['bundler'],
       matchPackageNames: [
-        'rack', // Needs to be synced with Rails version
         'strong_migrations', // Requires manual upgrade
         'sidekiq', // Requires manual upgrade
         'sidekiq-unique-jobs', // Requires manual upgrades and sync with Sidekiq version