ActiveRecord issue after upgrading to 2.18.0

[flying-robot]

Afternoon! We've been running RES in a Rails 8.1.1 application for a while with no issues. After the most recent upgrade from 2.17.1 to 2.18.0, we hit the following issue in one of our initializers:

config/initializers/postgresql_adapter.rb:3:in '<main>': uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter (NameError)

ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type = :timestamptz
                                ^^^^^^^^^^^^^^^^^^^

The culprit seems to be this change: dd520. If we reset the code in active_record.rb to c54cb, then the application boots successfully. I worked around this within our initializer by making things more deterministic, but just wanted to surface the issue for y'all:

# frozen_string_literal: true

ActiveSupport.on_load(:active_record) do
  require "active_record/connection_adapters/postgresql_adapter"

  ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type = :timestamptz
end

Thanks in advance!