Don't run rubocop after generation on Ruby 3.4+

Author: rafaelfranca

railties/test/application/generators_test.rb

@@ -256,13 +256,15 @@ def check_expected
       assert_match(/# Add comment to model/, File.read(model_file))
     end
 
-    test "generators with apply_rubocop_autocorrect_after_generate!" do
-      with_config do |c|
-        c.generators.apply_rubocop_autocorrect_after_generate!
-      end
+    if RUBY_VERSION < "3.4" # Revisit when 3.4 is added to the matrix
+      test "generators with apply_rubocop_autocorrect_after_generate!" do
+        with_config do |c|
+          c.generators.apply_rubocop_autocorrect_after_generate!
+        end
 
-      output = rails("generate", "model", "post", "title:string", "body:string")
-      assert_match(/3 files inspected, no offenses detected/, output)
+        output = rails("generate", "model", "post", "title:string", "body:string")
+        assert_match(/3 files inspected, no offenses detected/, output)
+      end
     end
   end
 end