/usr/lib/ruby/ is in ruby-rails-deprecated-sanitizer 1.0.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rails-deprecated_sanitizer.rb
/usr/lib/ruby/vendor_ruby/rails/
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/railtie.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/version.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/selector.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/node.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/version.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/sanitizer.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/document.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner/html/tokenizer.rb
/usr/lib/ruby/vendor_ruby/rails/deprecated_sanitizer/html-scanner.rb