Update input_to_output method arguments to use dissimilar names

This method using `_` for both arguments was causing Sorbet to fail when generating type information (sorbet/sorbet#3561). This change doesn't modify any functionality or outward API in the gem itself. The argument names are based on the arguments for input_to_output in `lib/bootsnap/compile_cache/yaml.rb`.

lib/bootsnap/compile_cache/iseq.rb

@@ -35,7 +35,7 @@ def self.fetch(path, cache_dir: ISeq.cache_dir)
         )
       end
 
-      def self.input_to_output(_, _)
+      def self.input_to_output(_data, _kwargs)
         nil # ruby handles this
       end