Deprecation warning on ruby 3.4

[yob]

When starting my rails app that includes stringex on ruby 3.4.2, I get this deprecation warning:

/Users/james/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/stringex-2.8.6/lib/stringex.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.

It's not causing any issues now, but it seems like an explicit dependency might be required for this to continue working on ruby 3.5 when it comes out.