Ruby 3.2 Support

[leanne73]

It would be great if Ruby 3.2 support could be added to this gem, especially as Ruby 3.1 EOL is coming soon on 3/31/25.

I think the only blocker is that Ruby 3.2 drops support for the File.exists? method, replacing it with File.exist?, and there's already an open PR to make this change: #54