Tests fail with Ruby 3.0

[dleidert]

Hello,

as part of the Debian Ruby team, we are currently building and testing all gems with Ruby 3.0. In this case your gem fails. Many test failures have a similar backtrace like this:

     Failure/Error: super()

     ArgumentError:
       wrong number of arguments (given 0, expected 2)
     # ./lib/safe_yaml/safe_to_ruby_visitor.rb:14:in `initialize'
     # ./lib/safe_yaml/psych_resolver.rb:25:in `new'
     # ./lib/safe_yaml/psych_resolver.rb:25:in `native_resolve'
     # ./lib/safe_yaml/resolver.rb:12:in `resolve_node'
     # ./lib/safe_yaml/resolver.rb:55:in `block in resolve_seq'
     # ./lib/safe_yaml/resolver.rb:55:in `each'
     # ./lib/safe_yaml/resolver.rb:55:in `inject'
     # ./lib/safe_yaml/resolver.rb:55:in `resolve_seq'
     # ./lib/safe_yaml/psych_resolver.rb:17:in `resolve_root'
     # ./lib/safe_yaml/resolver.rb:16:in `resolve_node'
     # ./lib/safe_yaml/load.rb:151:in `load'
     # ./lib/safe_yaml.rb:29:in `safe_load'
     # ./spec/safe_yaml_spec.rb:319:in `block (4 levels) in <top (required)>'

There seems to be a possible explanation here: paolobrasolin/jekyll-antex#16.

The full build log is available here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996380#5