Maintenance: Decrease the migration version due to a MySQL issue with ID columns.

db/migrate/20230607083454_time_accounting_enhancements.rb

@@ -1,6 +1,6 @@
 # Copyright (C) 2012-2023 Zammad Foundation, https://zammad-foundation.org/
 
-class TimeAccountingEnhancements < ActiveRecord::Migration[6.1]
+class TimeAccountingEnhancements < ActiveRecord::Migration[5.0]
   def change
     # return if it's a new setup
     return if !Setting.exists?(name: 'system_init_done')