Add ostruct to Gemfile for Ruby >= 3.4

Context:

warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.

Author: wasifhossain

Gemfile

@@ -97,6 +97,10 @@ group :development, :test do
     gem 'rubocop-minitest', '~> 0.31.0', require: false
     gem 'rubocop-rails', '~> 2.20.0', require: false
     gem 'rubocop-rake', '~> 0.6.0', require: false
+
+    if RUBY_VERSION >= '3.4.0'
+      gem 'ostruct', require: false
+    end
   end
   if version <= '5.0'
     gem 'loofah', '< 2.21.0'