Support for writing style deprecated in 7.1 and removed in 7.2

[hatsu38]

This writing style will be deprecated in 7.1 and will not be available in 7.2.

serialize :tokens, DeviseTokenAuth::Concerns::TokensSerialization

FYI: https://github.com/rails/rails/blob/bd4996bdfddb3d9c74ec5e91674f9b0c6e1693dc/activerecord/lib/active_record/attribute_methods/serialization.rb#L186C1-L193C42

               ActiveRecord.deprecator.warn(<<~MSG)
                Passing the coder as positional argument is deprecated and will be removed in Rails 7.2.
                Please pass the coder as a keyword argument:
                  serialize #{attr_name.inspect}, coder: #{class_name_or_coder}
              MSG
              coder = class_name_or_coder

These are the results of local testing.