Merge commit '3a2a15c6ea4d4603469861ed9be09da12a122e45' into glitch-soc/merge-upstream

Conflicts:
- `app/views/settings/preferences/appearance/show.html.haml`:
  Conflict because glitch-soc does not have a theme selector here.

app/models/account.rb

@@ -144,6 +144,7 @@ class Account < ApplicationRecord
            :locale,
            :shows_application?,
            :prefers_noindex?,
+           :time_zone,
            to: :user,
            prefix: true,
            allow_nil: true