Regression in Mode arguments in 3.3.2

### Version Docker's `ruby:3.3.2-bookworm` image. Ruby 3.3.2 implicitly includes CSV [3.2.8](https://stdgems.org/3.3.2/) We recently bumped CSV to 3.3.2 in our Gemfile.lock ### Reproduction `CSV.open(Tempfile.new.path, 577)` ### Expected Behavior CSV.open returns an IO object/file handle. ### Current Behavior `NoMethodError: undefined method `include?' for an instance of Integer` ### Additional Info This previously worked in 3.2.8. We believe that commit https://github.com/ruby/csv/commit/b706d91de8ec640d2918a3b4ff8828bcd6d0f09e introduced this behavior. Our understanding of the docs is that CSV.open mimics Ruby's File.open mode argument, which does accepts numeric permissions `File.open(Tempfile.new.path, 577)` returns a file handle.