Remove ActiveRecord monkey patch when it's no longer needed

config/initializers/ar_monkey_patch.rb it fixes the bug https://github.com/rails/rails/issues/26024 Check the status of the issue and if it's already fixed remove the monkey patch.

Just in case, check this tests (it's aready covered with GitLab tests though ):

require 'active_record'
require 'minitest/autorun'
require 'sqlite3'
require 'logger'

ActiveRecord::Base.establish_connection 'sqlite3::memory:'

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.string :name
    t.integer :lock_version
  end
end

class Post < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_lock_version_without_default_value
    Post.destroy_all

    #Post.create!(name: 'First')
    ActiveRecord::Base.connection.execute("insert into posts(name) VALUES('Mark')")

    p1 = Post.first
    p1.name = "Michael"
    p1.save
  end

  def test_lock_version_without_default_value1
    Post.destroy_all

    Post.create!(name: 'First')

    p1 = Post.first
    p1.update(name: "Michael")
  end

  def test_lock_version_without_default_value_when_form_submit
    Post.destroy_all
    ActiveRecord::Base.connection.execute("insert into posts(name) VALUES('Mark')")

    p1 = Post.first
    p1.update_attributes(name: "Bob", lock_version: 0)
    p1.save!
  end

  def test_lock_version_without_default_value_when_form_submit1
    Post.destroy_all
    ActiveRecord::Base.connection.execute("insert into posts(name) VALUES('Mark')")

    p1 = Post.first
    p1.update_attributes(name: "Bob", lock_version: '0')
    p1.save!
  end
end