Fix OpenID spec failure that assumed current_sign_in_at would be set

Due to 6a915d6f, the `current_sign_in_at` may not actually be set due
to an ExclusiveLease in other jobs. To fix this spec, manually set
the value in the setup.

Closes #32041

spec/requests/openid_connect_spec.rb

 require 'spec_helper'
 
 describe 'OpenID Connect requests' do
-  let(:user) { create :user }
+  let(:user) { create(:user, current_sign_in_at: Time.now) }
   let(:access_grant) { create :oauth_access_grant, application: application, resource_owner_id: user.id }
   let(:access_token) { create :oauth_access_token, application: application, resource_owner_id: user.id }