[ruby/psych] Add msys2 dependencies for windows

https://github.com/ruby/psych/commit/9a3816d903
2022-12-15 17:18:53 -07:00 · 2022-12-15 17:18:53 -07:00 · f877805a0c
--- a/ext/psych/psych.gemspec
+++ b/ext/psych/psych.gemspec
@ -63,4 +63,6 @@ DESCRIPTION
    s.add_dependency 'stringio'
  end
  
+  s.metadata['msys2_mingw_dependencies'] = 'libyaml libyaml-devel'
+
 end