OpenStruct will no longer be a default gem in Ruby 3.5

[Mado13]

While upgrading my app to Ruby 3.4.7, I received a deprecation warning stating that OpenStruct will no longer be part of the standard library by default starting in Ruby 3.5.0.

Graphiti depends on OpenStruct, so I had to manually add gem 'ostruct' to my Gemfile to avoid errors.

It might be good to explicitly include ostruct as a runtime dependency in the gemspec to ensure compatibility with Ruby ≥3.5.

Thanks!