Process blob variants using local files

Rails does post-upload variant processing using the same file upload
in https://github.com/rails/rails/pull/56327

Unrelated Lexxy bump:
Pulls in https://github.com/basecamp/lexxy/pull/493 to work around `dom_id`
removal from ActionText tag in https://github.com/rails/rails/pull/51238

config/initializers/active_storage.rb

@@ -11,10 +11,9 @@ end
 # before the User model's upload callback, causing FileNotFoundError when
 # using `process: :immediately` for variants.
 # See: https://github.com/rails/rails/issues/53694
-#
-# ActiveSupport.on_load(:active_storage_record) do
-#   configure_replica_connections
-# end
+ActiveSupport.on_load(:active_storage_record) do
+  configure_replica_connections
+end
 
 module ActiveStorageControllerExtensions
   extend ActiveSupport::Concern