[Fix] Nested module include is not supported until ruby 3.0

[khiav223577]

It will raise undefined method `remove_alias_attribute' in ruby 2.x

Ruby 2.6, 2.7

module ModuleA
  def a
    p 'a'
  end
end

module ModuleB
  def b
    p 'b'
  end
end

class C
  def c
    p 'c'
  end
end

C.include ModuleA
ModuleA.include ModuleB

C.new.a
# => "a"

C.new.b
# NoMethodError (undefined method `b' for #<C:0x00007fc0e1095b88>)

C.new.c
# => "c"

Ruby 3.0

module ModuleA
  def a
    p 'a'
  end
end

module ModuleB
  def b
    p 'b'
  end
end

class C
  def c
    p 'c'
  end
end

C.include ModuleA
ModuleA.include ModuleB

C.new.a
# => "a"

C.new.b
# => "b"

C.new.c
# => "c"

[khiav223577]

move this line to below require 'lib/mysql2_connection' in order to let ActiveModel::AttributeMethods be included first and then include adaptive_alias patch, which will cause problem in ruby 2.6, 2.7.