Let Data-related specs be tagged if Data.define is not defined yet

Author: eregon

spec/ruby/core/data/fixtures/classes.rb

@@ -1,5 +1,5 @@
 module DataSpecs
-  ruby_version_is "3.2" do
+  guard -> { ruby_version_is "3.2" and Data.respond_to?(:define) } do
     Measure = Data.define(:amount, :unit)
   end
 end