Explicitly require ostruct for StimulusReflex::Dataset and `Eleme…

…nt` (#697)

Rubocop v1.63.0 updates json v2.7.2. StimulusReflex relies on OpenStruct in both the
Dataset and the Element models. Attempting to run rails, ie a rails console, results in the error. This pull requets fixes this by explicitly requiring `ostruct`.

We should think about migrating off of `OpenStruct`, but this PR should make it work for now as a work-around.

Fixes #695

lib/stimulus_reflex.rb

@@ -3,6 +3,7 @@
 require "uri"
 require "open-uri"
 require "rack"
+require "ostruct"
 require "active_support/all"
 require "action_dispatch"
 require "action_cable"