fix: allow "syntax_tree-rbs" to be used in "stree write --plugin=rbs"

[ms-jpq]

Error

wrong number of arguments (given 3, expected 1..2)
/root/.local/asdf/installs/ruby/3.2.6/lib/ruby/gems/3.2.0/gems/syntax_tree-rbs-1.0.0/lib/syntax_tree/rbs.rb:44:in `format'
/root/.local/asdf/installs/ruby/3.2.6/lib/ruby/gems/3.2.0/gems/syntax_tree-6.2.0/lib/syntax_tree/cli.rb:388:in `run'
/root/.local/asdf/installs/ruby/3.2.6/lib/ruby/gems/3.2.0/gems/syntax_tree-6.2.0/lib/syntax_tree/cli.rb:671:in `block (2 levels) in process_queue'

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Replication

gem "syntax_tree"
gem "syntax_tree-rbs"

bundle exec stree write -- "..."

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See https://github.com/anthropics/anthropic-sdk-ruby/blob/b6fd5e4a006c0720e5256fdece4943e45bb789c8/Gemfile#L15