fix CI

lib/stimulus_reflex/open_struct_fix.rb

@@ -6,7 +6,7 @@
 # Calling this in OpenStruct 0.5.2 fails:
 # os = OpenStruct.new(class: "my-class", method: "post")
 
-if OpenStruct::VERSION == "0.5.2"
+if defined?(OpenStruct::VERSION) && OpenStruct::VERSION == "0.5.2"
   class OpenStruct
     private def is_method_protected!(name)
       if !respond_to?(name, true)
@@ -15,10 +15,10 @@ class OpenStruct
         true
       else
         owner = method!(name).owner
-        if owner.class == ::Class
+        if owner.instance_of?(::Class)
           owner < ::OpenStruct
         else
-          self.class!.ancestors.any? do |mod|
+          class!.ancestors.any? do |mod|
             return false if mod == ::OpenStruct
             mod == owner
           end