Add Prism::Node#deprecated method type

Author: S-H-GAMELINKS

templates/sig/prism/node.rbs.erb

@@ -19,6 +19,7 @@ module Prism
     def pretty_print: (untyped q) -> untyped
     def to_dot: () -> String
     def tunnel: (Integer line, Integer column) -> Array[Prism::node]
+    def deprecated: (*String) -> void
   end
 
   type node_singleton = singleton(Node) & _NodeSingleton