Compatibilty with Psych 4 (and Solidus v3.1.7)

[afdev82]

Steps to reproduce

I'm using Alchemy v6 with Solidus v3.1.7.
Just starting the application server throws an error and the server stops.

Expected behavior

The application starts without problems.

Actual behavior

I'm getting the following error:

wrong number of arguments (given 4, expected 1) (ArgumentError)
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/gems/psych-4.0.4/lib/psych.rb:322:in `safe_load'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/lib/alchemy/config.rb:58:in `read_file'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/lib/alchemy/config.rb:41:in `alchemy_config'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/lib/alchemy/config.rb:27:in `show'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/lib/alchemy/config.rb:12:in `get'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/app/models/alchemy/attachment.rb:88:in `<class:Attachment>'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/app/models/alchemy/attachment.rb:21:in `<module:Alchemy>'
  /home/antonio/.rbenv/versions/2.7.6/lib/ruby/gems/2.7.0/bundler/gems/alchemy_cms-d5f1dad16a55/app/models/alchemy/attachment.rb:20:in `<main>'

System configuration

• Alchemy Version: v6.0.0
• Rails Version: 6.1.6.1
• Solidus Version: 3.1.7

The version of Solidus used requires Psych 4 and I saw that Alchemy uses the safe_load method that needs to be adapted or replaced with unsafe_load as already done in Rails.
See also this issue: ruby/psych#533

[afdev82]

I've just realized that I was running the v6.0.0 of Alchemy, with the latest version (v6.0.5) I don't have this problem.
Sorry for the noise.