fix: Update in preparation for Ruby 3 (#44)

Author: nickevansuk

spec/data_structure/data_structure_spec.rb

@@ -18,7 +18,9 @@
       }
     ]
 
-  objs.each do |model:, data:|
+  objs.each do |obj|
+    model = obj[:model]
+    data = obj[:data]
     describe model do
       let(:inst) { model.deserialize(data) }
 

spec/data_typing/data_typing_spec.rb

@@ -15,7 +15,10 @@
       }
     ]
 
-  objs.each do |model:, data:|
+  objs.each do |obj|
+    model = obj[:model]
+    data = obj[:data]
+    
     describe model do
       describe "#type" do
         it "reserializes to original value" do