/usr/lib/ruby/ is in ruby-gherkin 4.0.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/gherkin/
/usr/lib/ruby/vendor_ruby/gherkin/ast_builder.rb
/usr/lib/ruby/vendor_ruby/gherkin/ast_node.rb
/usr/lib/ruby/vendor_ruby/gherkin/dialect.rb
/usr/lib/ruby/vendor_ruby/gherkin/errors.rb
/usr/lib/ruby/vendor_ruby/gherkin/gherkin-languages.json
/usr/lib/ruby/vendor_ruby/gherkin/gherkin_line.rb
/usr/lib/ruby/vendor_ruby/gherkin/parser.rb
/usr/lib/ruby/vendor_ruby/gherkin/pickles/
/usr/lib/ruby/vendor_ruby/gherkin/pickles/compiler.rb
/usr/lib/ruby/vendor_ruby/gherkin/token.rb
/usr/lib/ruby/vendor_ruby/gherkin/token_formatter_builder.rb
/usr/lib/ruby/vendor_ruby/gherkin/token_matcher.rb
/usr/lib/ruby/vendor_ruby/gherkin/token_scanner.rb