typeprof-0.21.11 + rbs-3.6.0 raise NoMethodError

How to reproduce:

% docker run --rm -it ruby:3.3.5 /bin/bash
root@5086137b08f0:/# gem i typeprof:0.21.11
Fetching typeprof-0.21.11.gem
Successfully installed typeprof-0.21.11
1 gem installed
A new release of RubyGems is available: 3.5.16 → 3.5.20!
Run `gem update --system 3.5.20` to update your installation.
root@5086137b08f0:/# typeprof --version
typeprof 0.21.11
root@5086137b08f0:/# typeprof /dev/null
# TypeProf 0.21.11
# Classes
root@5086137b08f0:/# gem update rbs
Updating installed gems
Updating rbs
Fetching rbs-3.6.0.gem
Building native extensions. This could take a while...
Successfully installed rbs-3.6.0
Gems updated: rbs
root@5086137b08f0:/# typeprof /dev/null
/usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:451:in `conv_block': undefined method `required_positionals' for an instance of RBS::Types::UntypedFunction (NoMethodError)
      lead_tys = blk.required_positionals.map {|type| conv_type(type.type) }
                    ^^^^^^^^^^^^^^^^^^^^^
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:405:in `conv_func'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:396:in `block in conv_method_def'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:395:in `map'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:395:in `conv_method_def'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:216:in `block (3 levels) in conv_classes'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:199:in `each'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:199:in `block (2 levels) in conv_classes'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:189:in `each'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:189:in `block in conv_classes'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:349:in `each_class_decl'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:171:in `conv_classes'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:135:in `dump_json'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:123:in `load_rbs'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:42:in `get_builtin_env'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/import.rb:17:in `initialize'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/analyzer.rb:306:in `new'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/analyzer.rb:306:in `initialize'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/config.rb:89:in `new'
    from /usr/local/bundle/gems/typeprof-0.21.11/lib/typeprof/config.rb:89:in `analyze'
    from /usr/local/bundle/gems/typeprof-0.21.11/exe/typeprof:9:in `<top (required)>'
    from /usr/local/bundle/bin/typeprof:25:in `load'
    from /usr/local/bundle/bin/typeprof:25:in `<main>'

Reproduce the failure with Ruby 3.3.5, typeprof 0.21.11, and rbs 3.6.0, then inspect lib/typeprof/import.rb at conv_block around line 451. Confirm that typeprof /dev/null completes without the NoMethodError after the compatibility issue is addressed.