Fix deprecation warning about serializer keywords

    DEPRECATION WARNING: Passing the class as positional argument is deprecated and will be removed in Rails 7.2.

    Please pass the class as a keyword argument:

      serialize :serialized, type: Array
     (called from <class:TestSerializedColumn> at /home/andy/src/oracle-enhanced/spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb:446)

spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb

@@ -443,7 +443,7 @@ class ::TestPost < ActiveRecord::Base
         end
       end
       class ::TestSerializedColumn < ActiveRecord::Base
-        serialize :serialized, Array
+        serialize :serialized, type: Array
       end
     end