Remove Ruby 3.2 feature use

Author: havenwood

lib/json/add/arithmetic_sequence.rb

@@ -52,6 +52,8 @@ def as_json(*)
     #   {"json_class":"Enumerator::ArithmeticSequence","b":42,"e":72,"x":false,"s":3}
     #   {"json_class":"Enumerator::ArithmeticSequence","b":42,"e":72,"x":true,"s":4}
     #
-    def to_json(*) = as_json.to_json(*)
+    def to_json(*args)
+      as_json.to_json(*args)
+    end
   end
 end